Derivatives of 4-(imidazol-5-yl)-2-(4-sulfoanilino)pyrimidine with cdk inhibitory activity

ABSTRACT

Compounds of the formula (I): wherein R 1 , R 2 , R 3 , R 4 , R 5  and p are as defined within and a pharmaceutically acceptable salts and in vivo hydrolysable esters are described. Also described are processes for their preparation and their use as medicaments, particularly medicaments for producing a cell cycle inhibitory (anti-cell-proliferation) effect in a warm-blooded animal, such as man.

The invention relates to pyrimidine derivatives, or pharmaceutically acceptable salts or in vivo hydrolysable esters thereof, which possess cell-cycle inhibitory activity and are accordingly useful for their anti-cell-proliferation (such as anti-cancer) activity and are therefore useful in methods of treatment of the human or animal body. The invention also relates to processes for the manufacture of said pyrimidine derivatives, to pharmaceutical compositions containing them and to their use in the manufacture of medicaments of use in the production of an anti-cell-proliferation effect in a warm-blooded animal such as man.

A family of intracellular proteins called cyclins play a central role in the cell cycle. The synthesis and degradation of cyclins is tightly controlled such that their level of expression fluctuates during the cell cycle. Cyclins bind to cyclin-dependent serine/threonine Iinases (CDKs) and this association is essential for CDK (such as CDK1, CDK2, CDK4 and/or CDK6) activity within the cell. Although the precise details of how each of these factors combine to regulate CDK activity is poorly understood, the balance between the two dictates whether or not the cell will progress through the cell cycle.

The recent convergence of oncogene and tumour suppressor gene research has identified regulation of entry into the cell cycle as a key control point of mitogenesis in tumours. Moreover, CDKs appear to be downstream of a number of oncogene signalling pathways. Disregulation of CDK activity by upregulation of cyclins and/or deletion of endogenous inhibitors appears to be an important axis between mitogenic signalling pathways and proliferation of tumour cells.

Accordingly it has been recognised that an inhibitor of cell cycle kinases, particularly inhibitors of CDK2, CDK4 and/or CDK6 (which operate at the S-phase, G1-S and G1-S phase respectively) should be of value as a selective inhibitor of cell proliferation, such as growth of mammalian cancer cells.

The present invention is based on the discovery that certain pyrimidine compounds surprisingly inhibit the effects of cell cycle kinases showing selectivity for CDK2, CDK4 and CDK6, and thus possess anti-cell-proliferation properties. Such properties are expected to be of value in the treatment of disease states associated with aberrant cell cycles and cell proliferation such as cancers (solid tumours and leukemias), fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation.

Accordingly, the present invention provides a compound of the formula (IA), (IB), (IC), (ID), (IE) and (IF) of the following generic structure formula (I):

wherein R¹, R², R³, R⁴, R⁵ and p are as defined below; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

Specifically, according to the present invention there is provided a compound of formula (IA):

wherein:

R¹ is 2-(pyrazolyl-1-yl)ethyl, 3-(isoxazol-3-yloxy)propyl, 2-(isothiazol-3-yloxy)ethyl, 2-(thiadiazol-3-yloxy)ethyl, 1,3-dihydroxyprop-2-yl, 1-methyl-1-hydroxymethylethyl, 1,1-dimethylpropyl, 1-methylcyclopropyl, t-butyl, 2-morpholino-1,1-dimethylethyl, 2-pyrrolidin-1-yl-1,1-dimethylethyl, 2-methylthio-1,1-dimethylethyl, 1,3-dimethoxyprop-2-yl, 1-methoxyprop-2-yl, 1-hydroxyprop-2-yl, 1-ethoxyprop-2-yl, 1-propoxyprop-2-yl, ethoxyethyl or 2-methoxy-1,1-dimethylethyl; and

R² is hydrogen;

or R¹ and R² together form 2,2-dimethylaziridin-1-yl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

According to a further aspect of the present invention there is provided a compound of formula (IB):

wherein:

R¹ is pyrid-2-ylmethyl, 2-(2-methyl-1,2,4-triazol-5-yl)ethyl, 2-pyrid-2-ylethyl, 2-pyridazin-3-ylethyl, 2-(3,5-dimethyltriazol-4-yl)ethyl, 2-pyrid-3-ylethyl, 2-methoxyethyl, 3-(5-methylpyrazol-4-yl)propyl, 2-trifluoromethylpyrid-5-ylmethyl, 2-pyridazin-4-ylethyl, 1,1-dimethylprop-2-ynyl, 2-ethoxyethyl, 2-phenoxyethyl, 2-(4-methoxyphenoxy)ethyl, 2-(2-methoxyphenoxy)ethyl, 2-(vinyloxy)ethyl, 2-(isopropoxy)ethyl and 2-(propoxy)ethyl; and

R² is hydrogen or cyano;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof;

provided that when R¹ is 2-methoxyethyl, R² is cyano.

According to a further aspect of the present invention there is provided a compound of formula (IC):

wherein:

R¹ is hydrogen, heterocyclyl, C₁₋₆alkyl or C₁₋₆alkoxyC₁₋₆alkyl; wherein R¹ may be optionally substituted on carbon by one or more hydroxy, carboxy, C₁₋₆alkoxy, C₁₋₆alkoxycarbonyl, N,N-(C₁₋₆alkyl)₂amino, heterocyclyl, C₃₋₆cycloalkyl and C₁₋₆alkoxyC₁₋₆alkoxy; and wherein if a heterocyclyl contains an —NH— moiety, that nitrogen may be optionally substituted by C₁₋₆alkyl or benzyl;

R² is hydrogen, halo or cyano;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof;

provided that when R¹ is 2-methoxyethyl, cyclopropylmethyl or pyrid-2-ylmethyl, R² is not hydrogen.

According to a further aspect of the present invention there is provided a compound of formula (ID):

wherein:

R¹ is hydrogen, C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl-or methoxyethyl;

R² is hydrogen, halo or cyano;

R³ is C₂₋₆alkyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

According to a further aspect of the present invention there is provided a compound of formula (IE):

wherein:

R¹ is hydrogen, C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl;

R² is halo, cyano, C₁₋₃alkyl or C₁₋₃alkoxy;

p is 1-2; wherein the values of R² may be the same or different;

R³ is hydrogen, halo or cyano;

R⁴ is C₁₋₄alkyl;

R⁵ is C₁₋₆alkyl or C₂₋₆alkenyl; wherein R⁵ may be optionally substituted on carbon by one or more methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester-thereof;

provided that said compound is not 4-(1,2-dimethylimidazol-5-yl)-2-[2-methoxy-4-(N-methylsulphamoyl)-5-methylanilino]pyrimidine.

According to a further aspect of the present invention there is provided a compound of formula (IF):

wherein:

R¹ is C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, dimethylamino, 2,2,2-trifluoroethoxy, phenyl or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl;

R² is halo, cyano, C₁₋₃alkyl or C₁₋₃alkoxy;

p is 0-2; wherein the values of R² may be the same or different;

R³ is hydrogen, halo or cyano;

R⁴ is C₂₋₆alkyl;

R⁵ is C₁₋₆alkyl or C₂₋₆alkenyl; wherein R⁵ may be optionally substituted on carbon by one or more methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

According to a further aspect of the present invention there is provided a compound of formula (IG):

wherein:

R¹ is C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, dimethylamino, 2,2,2-trifluoroethoxy, phenyl or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl;

R² is halo, cyano, C₁₋₃alkyl or C₁₋₃alkoxy;

p is 0-2; wherein the values of R² may be the same or different;

R³ is hydrogen, halo or cyano;

R⁴ is n-propyl or C₄₋₆alkyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

In another aspect of the invention there is provided a compound of formula (IA) (as depicted above) wherein:

R¹ is 2-(pyrazolyl-1-yl)ethyl, 3-(isoxazol-3-yloxy)propyl, 2-(thiazol-3-yloxy)ethyl, 2-(thiadiazol-3-yloxy)ethyl, 1,3-dihydroxyprop-2-yl, 1-methyl-1-hydroxymethylethyl, 1,2-dimethylpropyl, 1-methylcyclopropyl, 2,2-dimethylaziridin-1-yl, t-butyl, 2-morpholino-1,1-dimethylethyl, 2-pyrrolidin-1-yl-1,1-dimethylethyl, 2-methylthio-1,1-dimethylethyl, 1,3-dimethoxyprop-2-yl, 1-methoxyprop-2-yl, 1-hydroxyprop-2-yl, 1-ethoxyprop-2-yl, 1-propoxyprop-2-yl, ethoxyethyl or 2-methoxy-1,1-dimethylethyl; and

R² is hydrogen;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

In another aspect of the present invention there is provided a compound of formula (IB) (as depicted above) wherein:

R¹ is pyrid-2-ylmethyl, 2-(2-methyl-1,2,4-triazol-5-yl)ethyl, 2-pyrid-2-ylethyl, 2-pyridazin-3-ylethyl, 2-(3,5-dimethyltriazol-4-yl)ethyl, 2-pyrid-3-ylethyl, 2-methoxyethyl, 3-(5-methylpyrazol-4-yl)propyl, 2-trifluoromethylpyrid-5-ylmethyl, 2-pyridazin-4-ylethyl, 1,1-dimethylpropyn-2-yl or 2-ethoxyethyl; and

R² is hydrogen or cyano;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof;

provided that when R¹ is 2-methoxyethyl, R² is cyano.

In another aspect of the present invention there is provided a compound of formula (IC) (as depicted above) wherein:

R¹ is hydrogen, C₁₋₆alkyl or C₁₋₆alkoxyC₁₋₆alkyl; and

R² is hydrogen, halo or cyano;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof;

provided that when R¹ is 2-methoxyethyl, R² is not hydrogen.

In another aspect of the present invention there is provided a compound of formula (IF) (as depicted above) wherein:

R¹ is C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, dimethylamino, 2,2,2-trifluoroethoxy or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl;

R² is halo, cyano, C₁₋₃alkyl or C₁₋₃alkoxy;

p is 0-2; wherein the values of R² may be the same or different;

R³ is hydrogen, halo or cyano;

R⁴ is C₂₋₆alkyl;

R⁵ is C₁₋₆-alkyl or C₂₋₆alkenyl; wherein R⁵ may be optionally substituted on carbon by one or more methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

In this specification the term “alkyl” includes both straight and branched chain alkyl groups but references to individual alkyl groups such as “propyl” are specific for the straight chain version only. For example, “C₁₋₆alkyl”, “C₂₋₆alkyl”, “C₁₋₄alkyl” and “C₁₋₃alkyl” include ethyl, propyl and isopropyl. Examples of “C₄₋₆alkyl” include t-butyl, isobutyl and sec-butyl. However, references to individual alkyl groups such as ‘propyl’ are specific for the straight chained version only and references to individual branched chain alkyl groups such as ‘isopropyl’ are specific for the branched chain version only. A similar convention applies to other radicals, for example “C₃₋₆cycloalkylC₁₋₃alkyl” includes cyclopropylmethyl, 1-cyclobutylethyl and 2-cyclopentylethyl. The term “halo” refers to fluoro, chloro, bromo and iodo.

Where optional substituents are chosen from “one or more” groups it is to be understood that this definition includes all substituents being chosen from one of the specified groups or the substituents being chosen from two or more of the specified groups.

A “heterocyclyl” is a saturated, partially saturated or unsaturated, monocyclic ring containing 4-6 atoms of which at least one atom is chosen from nitrogen, sulphur or oxygen, which may, unless otherwise specified, be carbon or nitrogen linked, and a ring sulphur atom may be optionally oxidised to form the S-oxide(s). Examples and suitable values of the term “heterocyclyl” are morpholino, piperidyl, pyridyl, pyranyl, pyrrolyl, isothiazolyl, thienyl, thiadiazolyl, piperazinyl, thiazolidinyl, thiomorpholino, pyrrolinyl, tetrahydropyranyl, to tetrahydrofuryl, imidazolyl, pyrimidyl, pyrazinyl, pyridazinyl and isoxazolyl. Suitably a “heterocyclyl” is tetrahydrofuryl. In another aspect of the invention, suitably “heterocyclyl” is pyrrolidinyl, morpholino, piperidinyl or tetrahydrofuryl.

Examples of “C₁₋₆alkoxy” and “C₁₋₃alkoxy” include methoxy, ethoxy and propoxy. Examples of “C₁₋₆alkoxycarbonyl” include methoxycarbonyl, ethoxycarbonyl and t-butoxycarbonyl. Examples of “N,N-(C₁₋₆alkoxy)₂amino” include dimethylamino, diethylamino and methylethylamino. Examples of “C₂₋₆alkenyl” and “C₂₋₄alkenyl” are vinyl, allyl and 1-propenyl. Examples of “C₂₋₄alkynyl” are ethynyl, 1-propynyl and 2-propynyl. Examples of “C₃₋₆cycloalkyl” are cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl. Examples of “heterocyclylC₁₋₃alkyl” include pyridylmethyl, 3-morpholinopropyl and 2-pyrimid-2-ylethyl. Examples of “CC₁₋₆alkoxyC₁₋₆alkyl” are 2-methoxyethyl, ethoxymethyl, 2-ethoxypropyl and 2-ethoxyethyl. Examples of “C₁₋₆alkoxyC₁₋₆alkoxy” are 2-methoxyethoxy, ethoxymethoxy, 2-ethoxypropoxy and 2-ethoxyethoxy.

A suitable pharmaceutically acceptable salt of a compound of the invention is, for example, an acid-addition salt of a compound of the invention which is sufficiently basic, for example, an acid-addition salt with, for example, an inorganic or organic acid, for example hydrochloric, hydrobromic, sulphuric, phosphoric, trifluoroacetic, citric or maleic acid. In addition a suitable pharmaceutically acceptable salt of a compound of the invention which is sufficiently acidic is an alkali metal salt, for example a sodium or potassium salt, an alkaline earth metal salt, for example a calcium or magnesium salt, an ammonium salt or a salt with an organic base which affords a physiologically-acceptable cation, for example a salt with methylamine, dimethylamine, trimethylamine, piperidine, morpholine or tris-(2-hydroxyethyl)amine.

An in vivo hydrolysable ester of a compound of the formula (I) containing carboxy or, hydroxy group is, for example, a pharmaceutically acceptable ester which is hydrolysed in the human or animal body to produce the parent acid or alcohol. Suitable pharmaceutically acceptable esters for carboxy include C₁₋₆alkoxymethyl esters for example methoxymethyl, C₁₋₆alkanoyloxymethyl esters for example pivaloyloxymethyl, phthalidyl esters, C₃₋₈cycloalkoxycarbonyloxyC₁₋₆alkyl esters for example 1-cyclohexylcarbonyloxyethyl; 1,3-dioxolen-2-onylmethyl esters for example 5-methyl-1,3-dioxolen-2-onylmethyl; and C₁₋₆alkoxycarbonyloxyethyl esters for example 1-methoxycarbonyloxyethyl and may be formed at any carboxy group in the compounds of this invention.

An in vivo hydrolysable ester of a compound of the formula (I) containing a hydroxy group includes inorganic esters such as phosphate esters and α-acyloxyalkyl ethers and related compounds which as a result of the in vivo hydrolysis of the ester breakdown to give the parent hydroxy group. Examples of α-acyloxyalkyl ethers include acetoxymethoxy and 2,2-dimethylpropionyloxy-methoxy. A selection of in vivo hydrolysable ester forming groups for hydroxy include alkanoyl, benzoyl, phenylacetyl and substituted benzoyl and phenylacetyl, alkoxycarbonyl (to give alkyl carbonate esters), dialkylcarbamoyl and N-(dialkylaminoethyl)-N-alkylcarbamoyl (to give carbamates), dialkylaminoacetyl and carboxyacetyl. Examples of substituents on benzoyl include morpholino and piperazino linked from a ring nitrogen atom via a methylene group to the 3- or 4-position of the benzoyl ring.

Some compounds of the formula (I) may have chiral centres and/or geometric isomeric centres (E- and Z-isomers), and it is to be understood that the invention encompasses all such optical, diastereoisomers and geometric isomers that-possess CDK inhibitory activity.

The invention relates to any and all tautomeric forms of the compounds of the formula (I) that possess CDK inhibitory activity. In particular the skilled reader will appreciate that when R⁴ is hydrogen, the imidazole ring as drawn in formula (I) may tautomerise.

It is also to be understood that certain compounds of the formula (I) can exist in solvated as well as unsolvated forms such as, for example, hydrated forms. It is to be understood that the invention encompasses all such solvated forms which possess CDK inhibitory activity.

Suitable values of R¹, R², R³, R⁴, R⁵ and p are as follows. Such values may be used where appropriate with any of the definitions, claims or embodiments defined hereinbefore or hereinafter.

For Compounds of Formula (IC).

R¹ is hydrogen or C₁₋₆alkoxyC₁₋₆alkyl.

R¹ is methyl, methoxyethyl or ethoxyethyl.

R¹ is hydrogen, methyl, ethyl, propyl, 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-isopropoxyethyl, 3-(t-butoxy)propyl, 3-ethoxypropyl and piperidinyl; wherein R¹ may be optionally substituted on carbon by one or more hydroxy, carboxy, methoxy, methoxycarbonyl, t-butoxycarbonyl, dimethylamino, diethylamino, cyclopropyl, 2-ethoxyethoxy, pyrrolidinyl, morpholino or piperidinyl; and wherein if said pyrrolidinyl or piperidinyl contains an —NH— moiety, that nitrogen may be optionally substituted by methyl, ethyl or benzyl.

R¹ is hydrogen, 2-methoxyethyl, methyl, 2-ethoxyethyl, 2-isopropoxyethyl, 2-propoxyethyl, 2-(cyclopropylmethoxy)ethyl, 3-(t-butoxy)propyl, 3-[2-(2-ethoxyethoxy)ethoxy]propyl, 3-(2-methoxyethoxy)propyl, carboxymethyl, t-butoxycarbonylmethyl, 2-hydroxyethyl, 2-(N-methylpyrrolidin-2-yl)ethyl, N-ethylpyrrolidin-2-ylmethyl, 2-pyrrolidin-1-ylethyl, 2-morpholinoethyl, 3-morpholinopropyl, N-benzylpiperidin4-yl, 2-piperdin-1-ylethyl, 2-dimethylaminoethyl, 2-diethylaminoethyl or methoxycarbonylmethyl.

R² is hydrogen or halo.

R² is hydrogen or bromo.

A compound of formula (IC) (as depicted above) wherein:

R¹ is hydrogen, methyl, ethyl, propyl, 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-isopropoxyethyl, 3-(t-butoxy)propyl, 3-ethoxypropyl and piperidinyl; wherein R¹ may be optionally substituted on carbon by one or more hydroxy, carboxy, methoxy, methoxycarbonyl, t-butoxycarbonyl, dimethylamino, diethylamino, cyclopropyl, 2-ethoxyethoxy, pyrrolidinyl, morpholino or piperidinyl; and wherein if said pyrrolidinyl or piperidinyl contains an —NH— moiety, that nitrogen may be optionally substituted by methyl, ethyl or benzyl; and

R² is hydrogen or halo;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof;

provided that when R¹ is 2-methoxyethyl or cyclopropylmethyl R² is not hydrogen.

A compound of formula (IC) (as depicted above) wherein:

R¹ is hydrogen, 2-methoxyethyl, methyl, 2-ethoxyethyl, 2-isopropoxyethyl, 2-propoxyethyl, 2-(cyclopropylmethoxy)ethyl, 3-(t-butoxy)propyl, 3-[2-(2-ethoxyethoxy)ethoxy]propyl, 3-(2-methoxyethoxy)propyl, carboxymethyl, t-butoxycarbonylmethyl, 2-hydroxyethyl, 2-(N-methylpyrrolidin-2-yl)ethyl, N-thylpyrrolidin-2-ylmethyl, 2-pyrrolidin-1-ylethyl, 2-morpholinoethyl, 3-morpholinopropyl, N-benzylpiperidin-4-yl, 2-piperdin-1-ylethyl, 2-dimethylaminoethyl, 2-diethylaminoethyl or methoxycarbonylmethyl; and

R² is hydrogen or bromo;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof;

provided that when R¹ is 2-methoxyethyl R² is not hydrogen.

For Compounds of Formula (ID).

R¹ is C₁₋₄alkyl, C₃₋₄cycloalkyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one methoxy.

R¹ is cyclopropyl, 2-methoxyethyl or tetrahydrofur-2-ylmethyl.

R¹ is C₁₋₄alkyl, C₃₋₆cycloalkyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methoxy or ethoxy.

R¹ is cyclopropyl, 2-methoxyethyl, 2-ethoxyethyl or tetrahydrofur-2-ylmethyl.

R² is hydrogen.

R³ is ethyl or isopropyl.

R³ is ethyl, propyl or isopropyl.

A compound of formula (ID) (as depicted above) wherein:

R¹ is C₁₋₄alkyl, C₃₋₆cycloalkyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methoxy or ethoxy;

R² is hydrogen; and

R³ is ethyl, propyl or isopropyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

A compound of formula (ID) (as depicted above) wherein:

R¹ is cyclopropyl, 2-methoxyethyl, 2-ethoxyethyl or tetrahydrofur-2-ylmethyl;

R²is hydrogen; and

R³ is ethyl, propyl or isopropyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

For Compounds of Formula (IE).

R¹ is hydrogen or C₁₋₄alkyl; wherein R¹ may be optionally substituted on carbon by one methoxy.

R¹ is hydrogen or 2-methoxyethyl.

R² is halo.

R² is fluoro.

p is 1.

R³ is hydrogen.

R⁴ is methyl.

A compound of formula (IE) (as depicted above) wherein:

R¹ is hydrogen or C₁₋₄alkyl; wherein R¹ may be optionally substituted on carbon by one methoxy;

R² is halo;

p is 1;

R³ is hydrogen; and

R⁴ is methyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

A compound of formula (IE) (as depicted above) wherein:

R¹ is hydrogen or 2-methoxyethyl;

R² is fluoro;

p is 1;

R³ is hydrogen; and

R⁴ is methyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

For Compounds of Formula (IF).

R¹ is C₁₋₄alkyl; wherein R¹ may be optionally substituted on carbon by one or more methoxy, trifluoromethyl or dimethylamino.

R¹ is methyl, 3-dimethylaminopropyl, 3-methoxypropyl, 3,3,3-trifluoropropyl or butyl.

R¹ is C₁₋₄alkyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methoxy, ethoxy, trifluoromethyl, dimethylamino or phenyl.

R¹ is methyl, 3-dimethylaminopropyl, 3-methoxypropyl, 3,3,3-trifluoropropyl, butyl, benzyl, tetrahydrofur-2-ylmethyl, 3-ethoxypropyl or 3-morpholinopropyl.

p is 0.

R³ is hydrogen.

R³ is hydrogen or halo.

R³ is hydrogen or bromo.

R⁴ is isopropyl.

R⁵ is methyl.

A compound of formula (IF) (as depicted above) wherein:

R¹ is C₁₋₄alkyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methoxy, ethoxy, trifluoromethyl, dimethylamino or phenyl;

p is 0;

R³ is hydrogen or halo;

R⁴ is isopropyl; and

R⁵ is methyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

A compound of formula (IF) (as depicted above) wherein:

R¹ is methyl, 3-dimethylaminopropyl, 3-methoxypropyl, 3,3,3-trifluoropropyl, butyl, benzyl, tetrahydrofur-2-ylmethyl, 3-ethoxypropyl or 3-morpholinopropyl.

p is 0;

R³ is hydrogen or bromo;

R⁴ is isopropyl; and

R⁵ is methyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

For Compounds of Formula (IG).

R¹ is C₁₋₄alkyl or C₃₋₆cycloalkyl; wherein R¹ may be optionally substituted on carbon by one or more methoxy or ethoxy.

R¹ is 2-methoxyethyl, 2ethoxyethyl or cyclopropyl.

p is 0.

R³ is hydrogen.

R⁴ is n-propyl or isobutyl.

A compound of formula (IG) (as depicted above) wherein:

R¹ is C₁₋₄alkyl or C₃₋₆cycloalkyl; wherein R¹ may be optionally substituted on carbon by one or more methoxy or ethoxy;

p is 0;

R³ is hydrogen; and

R⁴ is n-propyl or isobutyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

R¹ is 2-methoxyethyl, 2-ethoxyethyl or cyclopropyl;

p is 0;

R³ is hydrogen; and

R⁴ is n-propyl or isobutyl;

or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

In another aspect of the invention, particular compounds of the invention are any one of the Examples or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.

A particular aspect of the invention is that which relates to the compound of formula (I) or a pharmaceutically acceptable salt thereof.

For the avoidance of doubt, any aspect of the invention described herein that refers to a compound of formula (I) also relates to a compound of formula (IA), (IB), (IC), (ID), (IE), (IF) or (IG).

Another aspect of the present invention provides a process for preparing a compound of formula (I) or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof which process (wherein R¹, R², R³, R⁴, R⁵ and p are, unless otherwise specified, as defined in formula (I), or wherein if any of R¹, R², R³, R⁴, R⁵ and p are not defined in formula (I) R¹, R², R³, R⁴, and/or R⁵ are hydrogen and/or p is 0) comprises of: Process a) reaction of a pyrimidine of formula (II):

wherein L is a displaceable group; with an aniline of formula (III):

or Process b) reacting a compound of formula (IV):

with a compound of formula (V):

wherein T is O or S; R^(x) may be the same or different and is C₁₋₆alkyl; Process c) for compounds of formula (I) where R¹ is amino or a group R¹—NH₂—; reacting a pyrimidine of formula (VI):

wherein X is a displaceable group; with an amine of formula (VII): R^(a)—NH₂  (VII) wherein R^(a) is hydrogen or R¹; Process d) reacting a pyrimidine of formula (VIII)

with a compound of formula (IX):

where Y is a displaceable group; Process e) for compounds of formula (IF); oxidising a compound of formula (X):

and thereafter if necessary:

i) converting a compound of the formula (I) into another compound of the formula (I);

ii) removing any protecting groups;

iii) forming a pharmaceutically acceptable salt or in vivo hydrolysable ester.

L is a displaceable group, suitable values for L are for example, a halogeno or sulphonyloxy group, for example a chloro, bromo, methanesulphonyloxy or toluene-4-sulphonyloxy group.

X is a displaceable group, suitable values for X are for example, a fluoro or chloro group. Preferably X is fluoro.

Y is a displaceable group, suitable values for Y are for example, a halogeno or sulphonyloxy group, for example a bromo, iodo or trifluoromethanesulphonyloxy group. Preferably Y is iodo.

Specific reaction conditions for the above reactions are as follows.

Process a) Pyrimidines of formula (II) and anilines of formula (III) may be reacted together:

i) in the presence of a suitable solvent for example a ketone such as acetone or an alcohol such as ethanol or butanol or an aromatic hydrocarbon such as toluene or N-methyl pyrrolidine, optionally in the presence of a suitable acid for example an inorganic acid such as hydrochloric acid or sulphuric acid, or an organic acid such as acetic acid or formic acid (or a suitable Lewis acid) and at a temperature in the range of 0° C. to reflux, preferably reflux; or ii) under standard Buchwald conditions (for example see J. Am. Chem. Soc., 118, 7215; J. Am. Chem. Soc., 119, 8451; J. Org. Chem., 62, 1568 and 6066) for example in the presence of palladium acetate, in a suitable solvent for example an aromatic solvent such as toluene, benzene or xylene, with a suitable base for example an inorganic base such as caesium carbonate or an organic base such as potassium-t-butoxide, in the presence of a suitable ligand such as 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl and at a temperature in the range of 25 to 80° C.

Pyrimidines of the formula (II) where L is chloro may be prepared according to Scheme 1:

Anilines of formula (III) are commercially available compounds, or they are known in the literature, or they are prepared by standard processes known in the art.

Process b) Compounds of formula (IV) and compounds of formula (V) are reacted together in a suitable solvent such as N-methylpyrrolidinone or butanol at a temperature in the range of 100-200° C., preferably in the range of 150-170° C. The reaction is preferably conducted in the presence of a suitable base such as, for example, sodium hydride, sodium methoxide or potassium carbonate.

Compounds of formula (V) may be prepared according to Scheme 2:

Compounds of formula (IV) and (Va) are commercially available compounds, or they are known in the literature, or they are prepared by standard processes known in the art.

Process c) Compounds of formula (VI) and amines of formula (VII) may be reacted together in the presence of an inert solvent such as N-methylpyrrolidinone or pyridine, in the presence of a base for example an inorganic base such as caesium carbonate or in the presence of an organic base such as excess (VII) and at a temperature in the range of 25 to 80° C.

Compounds of formula (VI) (wherein X is chloro) may be prepared according to Scheme 3:

Compounds of formula (VIa) may be prepared according to Process a, Process b or Process d but wherein compounds (III), (IV) and (IX) are not substituted by R¹SO₂—.

Process d) Compounds of formula (VIII) and amines of formula (IX) may be reacted together under standard Buchwald conditions as described in Process a.

The synthesis of compounds of formula VIII) is described in Scheme 1.

Compounds of formula (IX) are commercially available compounds, or they are known in the literature, or they are prepared by standard processes known in the art.

Amines of formula (VI) are commercially available compounds, or they are known in the literature, or they are prepared by standard processes known in the art.

Process e) Compounds of formula (X) may be oxidised under standard sulphur oxidation conditions; for example using hydrogen peroxide and trifluoroacetic acid at a temperature, or oxone in methanol and acetone; or titanium isopropoxide and cumene hydroperoxide in butyl acetate; at a temperature in the range of 0° C. to reflux, preferably at or near room temperature.

Compounds of formula (X) may be prepared using a process described above for the preparation of a compound of formula (IF) but wherein the sulphone of formula (IF) is a sulphide.

In one aspect of the invention, there is provided a process for preparing a compound of formula (I) which is a process selected from Process a), Process b), Process c) or Process d).

In another aspect of the invention, there is provided a process for preparing a compound of formula (IF) which is Process e).

It will be appreciated that certain of the various ring substituents in the compounds of the present invention may be introduced by standard aromatic substitution reactions or generated by conventional functional group modifications either prior to or immediately following the processes mentioned above, and as such are included in the process aspect of the invention. Such reactions and modifications include, for example, introduction of a substituent by means of an aromatic substitution reaction, reduction of substituents, alkylation of substituents and oxidation of substituents. The reagents and reaction conditions for such procedures are well known in the chemical art. Particular examples of aromatic substitution reactions include the introduction of a nitro group using concentrated nitric acid, the introduction of an acyl group using, for example, an acyl halide and Lewis acid (such as aluminium trichloride) under Friedel Crafts conditions; the introduction of an alkyl group using an alkyl halide and Lewis acid (such as aluminium trichloride) under Friedel Crafts conditions; and the introduction of a halogeno group. Particular examples of modifications include the reduction of a nitro group to an amino group by for example, catalytic hydrogenation with a nickel catalyst or treatment with iron in the presence of hydrochloric acid with heating; oxidation of alkylthio to alkylsulphinyl or alkylsulphonyl.

It will also be appreciated that in some of the reactions mentioned herein it may be necessary/desirable to protect any sensitive groups in the compounds. The instances where protection is necessary or desirable and suitable methods for protection are known to those skilled in the art. Conventional protecting groups may be used in accordance with standard practice (for illustration see T. W. Green, Protective Groups in Organic Synthesis, John Wiley and Sons, 1991). Thus, if reactants include groups such as amino, carboxy or hydroxy it may besdesirable to protect the group in some of the reactions mentioned herein.

A suitable protecting group for an amino or alkylamino group is, for example, an acyl group, for example an alkanoyl group such as acetyl, an alkoxycarbonyl group, for example a methoxycarbonyl, ethoxycarbonyl or t-butoxycarbonyl group, an arylmethoxycarbonyl group, for example benzyloxycarbonyl, or an aroyl group, for example benzoyl. The deprotection conditions for the above protecting groups necessarily vary with the choice of protecting group. Thus, for example, an acyl group such as an alkanoyl or alkoxycarbonyl group or an aroyl group may be removed for example, by hydrolysis with a suitable base such as an alkali metal hydroxide, for example lithium or sodium hydroxide. Alternatively an acyl group such as a t-butoxycarbonyl group may be removed, for example, by treatment with a suitable acid as hydrochloric, sulphuric or phosphoric acid or trifluoroacetic acid and an arylmethoxycarbonyl group such as a benzyloxycarbonyl group may be removed, for example, by hydrogenation over a catalyst such as palladium-on-carbon, or by treatment with a Lewis acid for example boron tris(trifluoroacetate). A suitable alternative protecting group for a primary amino group is, for example, a phthaloyl group which may be removed by treatment with an alkylamine, for example dimethylaminopropylamine, or with hydrazine.

A suitable protecting group for a hydroxy group is, for example, an acyl group, for example an alkanoyl group such as acetyl, an aroyl group, for example benzoyl, or an arylmethyl group, for example benzyl. The deprotection conditions for the above protecting groups will necessarily vary with the choice of protecting group. Thus, for example, an acyl group such as an alkanoyl or an aroyl group may be removed, for example, by hydrolysis with a suitable base such as an alkali metal hydroxide, for example lithium or sodium hydroxide. Alternatively an arylmethyl group such as a benzyl group may be removed, for example, by hydrogenation over a catalyst such as palladium-on-carbon.

A suitable protecting group for a carboxy group is, for example, an esterifying group, for example a methyl or an ethyl group which may be removed, for example, by hydrolysis with a base such as sodium hydroxide, or for example a t-butyl group which may be removed, for example, by treatment with an acid, for example an organic acid such as trifluoroacetic acid, or for example a benzyl group which may be removed, for example, by hydrogenation over a catalyst such as palladium-on-carbon.

The protecting groups may be removed at any convenient stage in the synthesis using conventional techniques well known in the chemical art.

As stated hereinbefore the compounds defined in the present invention possesses anti-cell-proliferation activity such as anti-cancer activity which is believed to arise from the CDK inhibitory activity of the compound. These properties may be assessed, for example, using the procedures set out in WO 02/04429.

Although the pharmacological properties of the compounds of the formula (I) vary with structural change, in general activity possessed by compounds of the formula (I) may be demonstrated at IC₅₀ concentrations or doses in the range 250 μM to 1 nM in the in vitro assay described in WO 02/04429.

Typical IC₅₀ values for compounds of the invention when tested in the SRB assay described in WO 02104429 are in the range 1 mM to 1 nM.

According to a further aspect of the invention there is provided a pharmaceutical composition which comprises a pyrimidine derivative of the formula (I), or a pharmaceutically acceptable, salt or in vivo hydrolysable ester thereof, as defined hereinbefore in association with a pharmaceutically-acceptable diluent or carrier.

The composition may be in a form suitable for oral administration, for example as a tablet or capsule, for parenteral injection (including intravenous, subcutaneous, intramuscular, intravascular or infusion) as a sterile solution, suspension or emulsion, for topical administration as an ointment or cream or for rectal administration as a suppository.

In general the above compositions may be prepared in a conventional manner using conventional excipients.

The compound of formula (I) will normally be administered to a warm-blooded animal at a unit dose within the range 5-5000 mg per square meter body area of the animal, i.e. approximately 0.1-100 mg/kg, and this normally provides a therapeutically-effective dose. A unit dose form such as a tablet or capsule will usually contain, for example 1-250 mg of active ingredient. Preferably a daily dose in the range of 1-50 mg/kg is employed. However the daily dose will necessarily be varied depending upon the host treated, the particular route of administration, and the severity of the illness being treated. Accordingly the optimum dosage may be determined by the practitioner who is treating any particular patient.

According to a further aspect of the present invention there is provided a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined hereinbefore for use in a method of treatment of the human or animal body by therapy.

We have found that the compounds defined in the present invention, or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, are effective cell cycle inhibitors (anti-cell proliferation agents), which property is believed to arise from their CDK inhibitory properties. Accordingly the compounds of the present invention are expected to be useful in the treatment of diseases or medical conditions mediated alone or in part by CDK enzymes, i.e. the compounds may be used to produce a CDK inhibitory effect in a warm-blooded animal in need of such treatment. Thus the compounds of the present invention provide a method for treating the proliferation of malignant cells characterised by inhibition of CDK enzymes, i.e. the compounds may be used to produce an anti-proliferative effect mediated alone or in part by the inhibition of CDKs. Such a compound of the invention is expected to possess a wide range of anti-cancer properties as CDKs have been implicated in many common human cancers such as leukaemia and breast, lung, colon, rectal, stomach, prostate, bladder, pancreas and ovarian cancer. Thus it is expected that a compound of the invention will possess anti-cancer activity against these cancers. It is in addition expected that a compound of the present invention will possess activity against a range of leukaemias, lymphoid malignancies and solid tumours such as carcinomas and sarcomas in tissues such as the liver, kidney, prostate and pancreas. In particular such compounds of the invention are expected to slow advantageously the growth of primary and recurrent solid tumours of, for example, the colon, breast, prostate, lungs and skin. More particularly such compounds of the invention, or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, are expected to inhibit the growth of those primary and recurrent solid tumours which are associated with CDKs, especially those turnouts which are significantly dependent on CDKs for their growth and spread, including for example, certain tumours of the colon, breast, prostate, lung, vulva and skin. Particularly “cancer” is selected from leukaemia, breast cancer, lung cancer, colorectal cancer, stomach cancer, prostate cancer, bladder cancer, pancreatic cancer, ovarian cancer, liver cancer, kidney cancer, skin cancer and cancer of the vulva.

It is further expected that a compound of the present invention will possess activity against other cell-proliferation diseases in a wide range of other disease states including leukaemias, fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation.

Thus according to this aspect of the invention there is provided a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined hereinbefore for use as a medicament; and the use of a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined hereinbefore in the manufacture of a medicament for use in the production of a cell cycle inhibitory (anti-cell-proliferation) effect in a warm-blooded animal such as man. Particularly, an inhibitory effect is produced by preventing entry into or progression through the S phase by inhibition of CDK2, CDK4 and/or CDK6, especially CDK2.

According to a further feature of the invention, there is provided a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined herein before in the manufacture of a medicament for use in the treatment of cancers (solid tumours and leukaemias), fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation, particularly in the treatment of cancers.

According to a further feature of this aspect of the invention there is provided a method for producing a cell cycle inhibitory (anti-cell-proliferation) effect in a warm-blooded animal, such as man, in need of such treatment which comprises administering to said animal an effective amount of a compound as defined immediately above. Particularly, an inhibitory effect is produced by preventing entry into or progression through the S phase by inhibition of CDK2, CDK4 and/or CDK6, especially CDK2.

According to a further feature of this aspect of the invention there is provided a method for producing a cell cycle inhibitory (anti-cell-proliferation) effect in a warm-blooded animal, such as man, in need of such treatment which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as defined herein before. Particularly, an inhibitory effect is produced by preventing entry into or progression through the S phase by inhibition of CDK2, CDK4 and/or CDK6, especially CDK2.

According to an additional feature of this aspect of the invention there is provided a method of treating cancers (solid tumours and leukaemias), fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation, in a warm-blooded animal, such as man, in need of such treatment which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as defined herein before.

Particularly there is provided a method of treating cancer in a warm-blooded animal, such as man, in need of such treatment which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as defined herein before.

In a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined herein before in association with a pharmaceutically-acceptable diluent or carrier for use in the production of a cell cycle inhibitory (anti-cell-proliferation) effect in a warm-blooded animal such as man.

In a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined herein before in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment of cancers (solid tumours and leukaemias), fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation, in a warm-blooded animal such as man.

In a further aspect of the invention there is provided a pharmaceutical composition which comprises a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, as defined herein before in association with a pharmaceutically-acceptable diluent or carrier for use in the treatment of cancer in a warm-blooded animal such as man.

Preventing cells from entering DNA synthesis by inhibition of essential S-phase initiating activities such as CDK2 initiation may also be useful in protecting normal cells of the body from toxicity of cycle-specific pharmaceutical agents. Inhibition of CDK2 or 4 will prevent progression into the cell cycle in normal cells which could limit the toxicity of cycle-specific pharmaceutical agents which act in S-phase, G2 or mitosis. Such protection may result in the prevention of hair loss normally associated with these agents.

Therefore in a further aspect of the invention there is provided a compound of formula (I) as defined above or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof for use as a cell protective agent.

Therefore in a further aspect of the invention there is provided a compound of formula (I) as defined above or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof for use in preventing hair loss arising from the treatment of malignant conditions with pharmaceutical agents.

Examples of pharmaceutical agents for treating malignant conditions that are known to cause hair loss include alkylating agents such as ifosfamide and cyclophosphamide; antimetabolites such as methotrexate, 5-fluorouracil, gemcitabine and cytarabine; vinca alkaloids and analogues such as vincristine, vinbalstine, vindesine, vinorelbine; taxanes such as paclitaxel and docetaxel; topoisomerase I inhibitors such as irintotecan and topotecan; cytotoxic-antibiotics such as doxorubicin, daunorubicin, mitoxantrone, actinomycin-D and mitomycin; and others such as etoposide, and tretinoin.

In another aspect of the invention, the compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, may be administered in association with a one or more of the above pharmaceutical agents. In this instance the compound of formula (I) may be administered by systemic or non systemic means. Particularly the compound of formula (I) my may administered by non-systemic means, for example topical administration.

Therefore in an additional feature of the invention, there is provided a method of preventing hair loss during treatment for one or more malignant conditions with pharmaceutical agents, in a warm-blooded animal, such as man, which comprises administering to said animal an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof.

In an additional feature of the invention, there is provided a method of preventing hair loss during treatment for one or more malignant conditions with pharmaceutical agents, in a warm-blooded animal, such as man, which comprises administering to said animal an effective amount of a compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof in simultaneous, sequential or separate administration with an effective amount of said pharmaceutical agent.

According to a further aspect of the invention there is provided a pharmaceutical composition for use in preventing hair loss arising from the treatment of malignant conditions with pharmaceutical agents which comprises a compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, and said pharmaceutical agent, in association with a pharmaceutically acceptable diluent or carrier.

According to a further aspect of the present invention there is provided a kit comprising a compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, and a pharmaceutical agent for treating malignant conditions that is known to cause hair loss.

According to a further aspect of the present invention there is provided a kit comprising:

a) a compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, in a first unit dosage form;

b) a pharmaceutical agent for treating malignant conditions that is known to cause hair loss; in a second unit dosage form; and

c) container means for containing said first and second dosage forms.

According to another feature of the invention there is provided the use of a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, in the manufacture of a medicament for the prevention of hair loss during treatment of malignant conditions with pharmaceutical agents.

According to a further aspect of the present invention there is provided a combination treatment for the prevention of hair loss comprising the administration of an effective amount of a compound of the formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, optionally together with a pharmaceutically acceptable diluent or carrier, with the simultaneous, sequential or separate administration of an effective amount of a pharmaceutical agent for treatment of malignant conditions to a warm-blooded animal, such as man.

As stated above the size of the dose required for the therapeutic or prophylactic treatment of a particular cell-proliferation disease will necessarily be varied depending on the host treated, the route of administration and the severity of the illness being treated. A unit dose in the range, for example, 1-100 mg/kg, preferably 1-50 mg/kg is envisaged.

The CDK inhibitory activity defined hereinbefore may be applied as a sole therapy or may involve, in addition to a compound of the invention, one or more other substances and/or treatments. Such conjoint treatment may be achieved by way of the simultaneous, sequential or separate administration of the individual components of the treatment. In the field of medical oncology it is normal practice to use a combination of different forms of treatment to treat each patient with cancer. In medical oncology the other component(s) of such conjoint treatment in addition to the cell cycle inhibitory treatment defined hereinbefore may be: surgery, radiotherapy or chemotherapy. Such chemotherapy may cover three main categories of therapeutic agent:

(i) other cell cycle inhibitory agents that work by the same or different mechanisms from those defined hereinbefore;

(ii) cytostatic agents such as antioestrogens (for example tamoxifen, toremifene, raloxifene, droloxifene, iodoxyfene), progestogens (for example megestrol acetate), aromatase inhibitors (for example anastrozole, letrazole, vorazole, exemestane), antiprogestogens, antiandrogens (for example flutamide, nilutamide, bicalutamide, cyproterone acetate), LHRH agonists and antagonists (for example goserelin acetate, luprolide), inhibitors of testosterone 5α-dihydroreductase (for example finasteride), anti-invasion agents (for example metalloproteinase inhibitors like marimastat and inhibitors of urokinase plasminogen activator receptor function) and inhibitors of growth factor function, (such growth factors include for example platelet derived growth factor and hepatocyte growth factor such inhibitors include growth factor antibodies, growth factor receptor antibodies, tyrosine kinase inhibitors and serine/threonine kinase inhibitors); and

(iii) antiproliferative/antineoplastic drugs and combinations thereof, as used in medical oncology, such as antimetabolites (for example antifolates like methotrexate, fluoropyrimidines like 5-fluorouracil, purine and adenosine analogues, cytosine arabinoside); antitumour antibiotics (for example anthracyclines like doxorubicin, daunomycin, epirubicin and idarubicin, mitomycin-C, dactinomycin, mithramycin); platinum derivatives (for example cisplatin, carboplatin); alkylating agents (for example nitrogen mustard, melphalan, chlorambucil, busulphan, cyclophosphamide, ifosfamide, nitrosoureas, thiotepa); antimitotic agents (for example vinca alkaloids like vincristine and taxoids like taxol, taxotere); topoisomerase inhibitors (for example epipodophyllotoxins like etoposide and teniposide, amsacrine, topotecan). According to this aspect of the invention there is provided a pharmaceutical product comprising a compound of the formula (I) as defined hereinbefore and an additional anti-tumour substance as defined hereinbefore for the conjoint treatment of cancer.

In addition to their use in therapeutic medicine, the compounds of formula (I) and their pharmaceutically acceptable salts are also useful as pharmacological tools in the development and standardisation of in vitro and in vivo test systems for the evaluation of the effects of inhibitors of cell cycle activity in laboratory animals such as cats, dogs, rabbits, monkeys, rats and mice, as part of the search for new therapeutic agents.

In the above other pharmaceutical composition, process, method, use and medicament manufacture features, the alternative and preferred embodiments of the compounds of the invention described herein also apply.

Some of the intermediates described herein are novel and are thus provided as a further aspect of the invention. For example, an additional aspect of the invention refers to a compound of formula (X). A particular compound of formula (X) is 4-(1-isopropyl-2-methylimidazol-5-yl)-2-[4-(methylthio)anilino]pyrimidine (Method 86).

EXAMPLES

The invention will now be illustrated by the following non limiting examples in which, unless stated otherwise:

(i) temperatures are given in degrees Celsius (° C.); operations were carried out at room or ambient temperature, that is, at a temperature in the range of 18-25° C.;

(ii) organic solutions were dried over anhydrous magnesium sulphate; evaporation of solvent was carried out using a rotary evaporator under reduced pressure (600-4000 Pascals; 4.5-30 mmHg) with a bath temperature of up to 60° C.;

(iii) chromatography means flash chromatography on silica gel; thin layer chromatography (TLC) was carried out on silica gel plates;

(iv) in general, the course of reactions was followed by TLC and reaction times are given for illustration only;

(v) final products had satisfactory proton nuclear magnetic resonance (NMR) spectra and/or mass spectral data;

(vi) yields are given for illustration only and are not necessarily those which can be obtained by diligent process development; preparations were repeated if more material was required;

(vii) when given, NMR data is in the form of delta values for major diagnostic protons, given in parts per million (ppm) relative to tetramethylsilane (TMS) as an internal standard, determined at 300 MHz using perdeuterio dimethyl sulphoxide (DMSO-d₆) as solvent unless otherwise indicated;

(viii) chemical symbols have their usual meanings; SI units and symbols are used;

(ix) solvent ratios are given in volume:volume (v/v) terms; and

(x) mass spectra were run with an electron energy of 70 electron volts in the chemical ionization (CI) mode using a direct exposure probe; where indicated ionization was effected by electron impact (EI), fast atom bombardment (FAB) or electrospray (ESP); values for m/z are given; generally, only ions which indicate the parent mass are reported; and unless otherwise stated, the mass ion quoted is (MH)⁺;

(xi) unless stated otherwise compounds containing an asymmetrically substituted carbon and/or sulphur atom have not been resolved;

(xii) where a synthesis is described as being analogous to that described in a previous example the amounts used are the millimolar ratio equivalents to those used in the previous example;

(xvi) the following abbreviations have been used: DMFDMA dimethylformamide dimethylacetal; DMF dimethylformamide; EtOAc ethyl acetate; ether diethyl ether; MeOH methanol; and DCM dichloromethane;

xvii) where an Isolute SCX-2 column is referred to, this means an “ion exchange” extraction cartridge for adsorption of basic compounds, i.e. a polypropylene tube containing a benzenesulphonic acid based strong cation exchange sorbent, used according to the manufacturers instructions obtained from International Sorbent Technologies Limited, Dyffryn Business Park, Hengeod, Mid Glamorgan, UK, CF82 7RJ;

xviii) where an Isolute amine column is referred to, this means an “ion exchange” extraction cartridge for adsorption of acidic compounds, i.e. a polypropylene tube containing a amino silane covalently bonded to a silica particle used according to the manufacturers instructions obtained from International Sorbent Technologies Limited, Dyffryn Business Park, Hengeod, Mid Glamorgan, UTK, CF82 7RJ; and

xix) where a Chemelut column is referred to, this means an extraction cartridge for removal of water, i.e. a polypropylene tube containing diatomaceous earth used according to the manufacturers instructions obtained from Varian, Harbor City, Calif., USA.

Example 1 4-(1-Ethyl-2-methylimidazol-5-yl)-2-{4-[N-(2-ethoxyethyl)sulphamoyl]anilino}pyrimidine

Chlorosulphonic acid (280 μl, 4 mmol) was added dropwise to solution of 2-anilino-4-(1-ethyl-2-methylimidazol-5-yl)pyrimidine (Method 30; 279 mg, 1 mmol) in thionyl chloride (5 ml) cooled at 0° C. and the mixture stirred at 0° C. for 10 minutes then heated at 90° C. for 90 minutes. The volatiles were removed by evaporation and the residue was dried under high vacuum (<2 mmHg) for 1 hour. The resulting solid was placed under nitrogen and a solution of 2-ethoxyethylamine (356 mg, 4 mmol) and diethylmethylamine (1 ml, 15 mmol) in MeOH (3 ml) added. The mixture was stirred for 15 minutes and the volatiles were evaporated in vacuo. Water (20 ml) was added and extracted DCM (2×25 ml). DCM was dried and evaporated in vacuo. The residue was purified by flash chromatography on silica gel eluting with DCM:MeOH (100:0 increasing in polarity to 97:3) to yield a white foam. The white foam was dissolved in MeOH (3 ml) and treated with 1M HCl in ether (0.55 ml, 0.55 mmol). The solvent was evaporated in vacuo and the resultant solid triturated with ether, collected by filtration and dried-under vacuum at 60° C. to yield the title compound (128 mg, 47%) as a yellow solid. NMR: 1.05 (t, 3H), 1.30 (t, 3H), 2.76 (s, 3H), 2.88 (m, 2H), 3.32 (m, 4H), 4.76 (m, 2H), 7.37 (d, 1H), 7.52 (m, 1H), 7.73 (d, 2H), 7.90 (d, 2H), 8.43 (s, 1H), 8.65 (d, 1H), 10.14 (brs, 1H); m/z431.

Examples 2-41

The following compounds were prepared by the procedure of Example 1 using the appropriate amine and 2-anilino4-(1-ethyl-2-methylimidazol-5-yl)pyrimidine (Method 30; Examples 2-11, 15, 16, 31-34), 2-anilino-4-(1,2-dimethylimidazol-5-yl)pyrimidine (Method 34; Examples 12-14), 2-anilino-4-(1-isopropyl-2-methylimidazol-5-yl)pyrimidine (Method 31; Examples 17, 18, 23-30 and 35-41), 2-anilino-4-[1-(2-methylpropyl)-2-methylimidazol-5-yl]pyrimidine (Method 38; Examples 19-20) and 2-anilino4-(2-methyl-1-propylimidazol-5-yl)pyrimidine (Method 37; Examples 21-22).

Ex R¹ R² NMR M/z  2² Et

1.28(t, 3H), 2.72(s, 3H), 3.18(m, 2H), 3.22(m, 2H), 4.74(q, 2H), 7.38(d, 1H), 7.70(d, 2H), 7.78 (t, 1H), 7.88(t, 4H), 8.42(t, 1H), 8.47(s, 1H), 8.68(d, 1H), 8.78(d, 1H), 10.19(s, 1H) 464  3³ Et

1.28(t, 3H), 1.40(s, 6H), 2.71(s, 3H), 2.91(s, 1H), 4.72(q, 2H), 7.34(d, 1H), 7.74(d, 2H), 7.83 (d + m, 3H), 8.43(s, 1H), 8.68(d, 1H), 10.11(s, 1H) 425  4⁴ Et

1.30(t, 3H), 2.75(s, 3H), 4.18(d, 2H), 5.78(q, 2H), 7.40(d, 1H), 7.72(d, 2H), 7.80(d, 1H), 7.88 (d, 2H), 7.94(d, 1H), 8.29(t, 1H), 8.48(s, 1H), 8.60(s, 1H), 8.70(d, 1H), 10.18(s, 1H) 518  5⁵ Et

1.25(t, 3H), 2.49(s, 3H), 2.72(s, 3H), 2.95(m, 2H), 3.16(m, 2H), 4.73(q, 2H), 7.39(d, 1H), 7.75(d, 2H), 7.78(m, 1H), 7.90(d, 2H), 8.48(s, 1H), 8.67(d, 1H), 10.20(s, 1H) 468  6⁵ Et

1.25(t, 3H), 2.70(s, 3H), 2.82(m, 2H), 3.04(m, 2H), 4.72(q, 2H), 7.38(d, 1H), 7.63(m, 2H), 7.70(d, 2H), 7.88(d, 2H), 8.01(d, 1H), 8.41(s, 1H), 8.60(m, 2H), 8.65(d, 1H), 10.15(s, 1H) 464  7^(6,14) Et

1.25(t, 3H), 2.70(s, 3H), 3.08(t, 2H), 3.18(q, 2H), 4.72(q, 2H), 7.38(d, 1H), 7.68(t, LH), 7.70 (m, 4H), 7.88(d, 2H), 8.48(s, 1H), 8.68(d, 1H), 9.15(d, 1H), 10.18(s, 1H) 465  8⁷ Et

1.24(t, 3H), 2.22(s, 6H), 2.50(m, 2H), 2.71(s, 3H), 2.82(m, 2H), 4.72(q, 2H), 7.39(d, 1H), 7.60(t, 1H), 7.71(d, 2H), 7.89(d, 2H), 8.47(s, 1H), 8.68(d, 1H), 10.18(s, 1H) 481  9⁸ Et

1.25(t, 3H), 1.54(m, 2H), 2.14(s, 3H), 2.34(t, 2H), 2.72(m, 5H), 4.72(q, 2H), 7.36(d, 1H), 7.47(t, 1H), 7.59(s, 1H), 7.71(d, 2H), 7.88(d, 2H), 8.43(s, 1H), 8.67(d, 1H), 10.12(s, 1H) 481 10⁹ Et

1.25(t, 3H), 2.70(m, 5H), 2.81(t, 2H), 3.08(m, 2H), 4.72(q, 2H), 7.37(d, 1H), 7.64(m 1H), 7.71 (d + s, 3H), 7.89(d, 2H), 8.45(s, 1H), 8.68(d, 1H), 9.19(d, 2H), 10.14(s, 1H) 465 11 Et

1.20(t, 3H), 2.38(s, 3H), 4.04(s, 2H), 4.58(q, 2H), 7.21(m, 2H), 7.37(d, 1H), 7.70(m, 4H), 7.84(d, 2H), 8.41(d, 2H), 9.80(s, 1H) 450 12^(10,12) Me

2.35(s, 3H), 3.20(t, 2H), 3.95(s, 3H), 4.35(t, 2H), 7.20(d, 1H), 7.65(s, 1H), 7.75(m, 3H), 7.93(d, 2H), 8.30(s, 1H), 8.45(d, 1H), 9.95(s, 1H) 473 13¹¹ Me

2.35(s, 3H), 3.12(m, 2H), 3.95(s, 3H), 4.25(t, 2H), 6.65(d, 1H), 7.2(d, 1H), 7.60(s, 1H), 7.7 (m, 3H), 7.9(d, 2H), 8.25(d, 1H), 8.82(d, 1H), 9.9(s, 1H) 472 14^(10,13) Me

1.84(m, 2H), 2.40(s, 3H), 2.90(t, 2H), 3.95(s, 3H), 4.20(t, 2H), 6.25(s, 1H), 7.25(d, 1H), 7.50 (brs, 1H), 7.65(s, 1H), 7.75(d, 2H), 7.95(d, 2H), 8.45(d, 1H), 8.65(s, 1H), 9.95(s, 1H) 468 (M − H)⁻ 15 Et

1.03(d, 6H), 1.28(t, 3H), 2.71(s, 3H), 2.86(q, 2H), 3.31(t, 2H), 3.46(m, 1H), 4.74(q, 2H), 7.35 (d, 1H), 7.49(t, 1H), 7.72(d, 2H), 7.88(d, 2H), 8.42(s, 1H), 8.65(d, 1H), 10.12(s, 1H) 445 16 Et

0.81(t, 3H), 1.25(t, 3H), 1.44(m, 2H), 2.70(s, 3H), 2.88(q, 2H), 3.23(t, 2H), 3.34(t, 2H), 4.72 (q, 2H), 7.35(d, 1H), 7.49(t, LH), 7.72(d, 2H), 7.88(d, 2H), 8.42(s, 1H), 8.65(d, 1H), 10.12(s, 1H) 445 17 i-Pr

1.01(d, 6H), 1.50(d, 6H), 2.79(s, 3H), 2.84(q, 2H), 3.30(t, 2H), 3.50(m, 1H), 5.56(m, 1H), 7.24(d, 1H), 7.49(t, 1H), 7.70(d, 2H), 7.88(d, 2H), 8.42(s, 1H), 8.68(d, 1H), 10.17(s, 1H) 459 18 i-Pr

0.88(t, 3H), 1.42(quin, 2H), 1.51(d, 6H), 2.77 (s, 3H), 2.87(q, 2H), 3.23(t, 2H), 5.55(m, 1H), 7.24(d, 1H), 7.52(t, 1H), 7.70(d, 2H), 7.88(d, 2H), 8.42(s, 1H), 8.68(d, 1H), 10.17(s, 1H) 459 19 i-Bu

(400 MHz) 0.69(d, 6H), 1.78(m, 1H), 2.69(s, 3H), 2.88(m, 2H), 3.20(s, 3H), 3.32(m, 2H), 4.60(d, 2H), 7.36(d, 1H), 7.56(t, 1H), 7.73(d, 2H), 7.73(d, 2H), 8.42(s, 1H), 8.68(d, 1H), 10.20(s, 1H) 445 20 i-Bu

(400 MHz) 0.72(d, 6H), 1.06(t, 3H), 1.78(m, 1H), 2.72(s, 3H), 2.89(q, 2H), 3.36(m, 4H), 4.60(d, 2H), 7.36(d, 1H), 7.55(t, 1H), 7.75(d, 2H), 7.80(d, 2H), 8.43(s, 1H), 8.68(d, 1H), 10.20(s, 1H) 459 21 n-Pr

0.70(t, 3H), 1.03(t, 3H), 1.60(m, 2H), 2.73(s, 3H), 2.86(t, 2.04), 3.32(m, 4H), 4.69(t, 2H), 7.36(d, 1H), 7.57(brs, 1H), 7.73(d, 2H), 7.88 (d, 2H), 8.47(s, 1H), 8.64(d, 1H), 10.25(s, 1H) 445 22 n-Pr

0.70(t, 3H), 1.60(m, 2H), 2.72(s, 3H), 2.21(m, 2H), 3.16(m, 3H), 3.30(t, 2H), 4.68(t, 2H), 7.35 (d, 1H), 7.56(brs, 1H), 7.73(d, 2H), 7.87(d, 2H), 8.45(s, 1H), 8.65(d, 1H), 10.19(s, 1H) 431 23 i-Pr

484 24 i-Pr

484 25 i-Pr

470 26 i-Pr

486 27 i-Pr

500 28 i-Pr

484 29 i-Pr

1.48(d, 6H), 2.50(s, 3H), 2.78(m, 2H), 3.35(m, 2H), 4.62(t, 1H), 5.68(sept, 1H), 7.14(d, 1H), 7.38(brs, 1H), 7.48(s, 1H), 7.70(d, 2H), 7.89 (d, 2H), 8.47(d, 1H), 9.89(s, 1H) 417 30 i-Pr

1.55(m, 8H), 2.78(m, 5H), 3.18(s, 3H), 3.36(m, 6H), 5.58(m, 1H), 7.25(d, 1H), 7.41(t, 1H), 7.69 (d, 2H), 7.89(d, 2H), 8.19(s, 1H), 8.68(d, 1H), 10.19(s, 1H) 488 31 Et

1.22(t, 3H), 2.75(s, 3H), 3.10(t, 2H), 3.96(t, 2H), 4.74(m, 2H), 6.85(m, 3H), 7.22(t, 2H), 7.38(d, 1H), 7.76(d, 2H), 7.85(m, 1H), 7.92(d, 2H), 8.49(s, 1H), 8.63(d, 1H), 10.24(s, 1H) 479 32 Et

1.26(t, 3H), 2.72(s, 3H), 3.08(m, 2H), 3.65(s, 3H), 3.88(t, 2H), 4.73(m, 2H), 6.78(m, 4H), 7.37(d, 1H), 7.75(m, 3H), 7.89(d, 2H), 8.47(s, 1H), 8.65(d, 1H), 10.18(s, 1H) 509 33 Et

1.26(t, 3H), 2.93(s, 3H), 1.93(3.08), 3.73(s, 3H), 3.95(t, 2H), 4.74(m, 2H), 6.88(m, 4H), 7.38(d, 1H), 7.77(d, 3H), 7.91(d, 2H), 8.47(s, 1H), 8.65(d, 1H), 10.20(s, 1H) 509 34 Et

1.19(t, 3H), 2.40(s, 3H), 2.99(q, 2H), 3.65(t, 2H), 3.95(dd, 1H), 4.13(dd, 1H), 4.57(m, 2H), 6.43(dd, 1H), 7.21(d, 1H), 7.60(t, 1H), 7.68(s, 1H), 7.71(d, 2H), 7.89(d, 2H), 8.42(d, 1H), 9.81 (s, 1H) 429 35 i-Pr

1.05(s, 9H), 1.52(m, 8H), 2.06(m, 2H), 2.80(s, 3H), 3.24(t, 2H), 5.49(m, 1H), 7.25(d, 1H), 7.39 (brs, 1H), 7.70(d, 2H), 7.89(d, 2H), 8.21(s, 1H), 8.68(d, 1H), 10.20(s, 1H) 487 36 i-Pr

1.04(t, 3H), 1.54(m, 8H), 2.80(m, 5H), 3.38 (m, 12H), 5.58(m, 1H), 7.25(d, 1H), 7.41(brs, 1H), 7.70(d, 2H), 7.89(d, 2H), 8.21(s, 1H), 10.20(s, 1H) 547 37 i-Pr

444 38 i-Pr

472 39 i-Pr

1.30(s, 9H), 1.47(d, 6H), 3.53(d, 2H), 5.65(m, 1H), 7.14(d, 1H), 7.44(s, 1H), 7.67(d, 2H), 7.85 (m, 3H), 8.45(d, 1H), 9.86(s, 1H) 487 40 i-Pr

546 41 i-Pr

1.46(d, 6H), 3.26(s, 3H), 3.52(s, 3H), 3.66(s, 2H), 5.66(m, 1H), 7.14(d, 1H), 7.44(s, 1H), 7.68(d, 2H), 7.87(d, 2H), 7.96(s, 1H), 8.45(d, 1H), 9.87(s, 1H) 445 ¹Isolated as Free Base ²Purified by flash silica chromatography DCM:MeOH (96:4) ³Purified by flash silica chromatography DCM:MeOH (98:2 increasing in polarity to 96:4) ⁴Purified by flash silica chromatography DCM:MeOH (95:5) ⁵Purified by flash silica chromatography DCM:MeOH (98:2 increasing in polarity to 90:10). The residue was further purified by flash alumina chromatography DCM:MeOH (90:10) ⁶Water (15 ml) added, basified with saturated sodium bicarbonate solution to pH 8, extracted into EtOAc (5 × 15 ml). Organics were washed with brine (10 ml), dried evaporated. ⁷Purified by flash alumina chromatography DCM:MeOH (96:4 increasing in polarity to 80:20). ⁸Purified by flash alumina chromatography DCM:MeOH (98:2 increasing in polarity to 90:10). ⁹Purified by flash alumina chromatography DCM:MeOH (96:4 increasing in polarity to 90:10). The residue was further purified by flash silica chromatography (DCM:MeOH (97:3)): ammoma (100:0 increasing in polarity to 99:1) ¹⁰Purified by Isolute amine column ¹¹Recrystallised from MeOH ¹²Starting amine - Method 78 ¹³Starting amine - Method 79 ¹⁴Starting amine - JACS 1950, 72, 3539

Examples 42-45

The following compounds were prepared by the procedure of Example 1 using the appropriate amine and 2-anilino-4-(1-propylimidazol-5-yl)pyrimidine (Method 36; Examples 42, 44 and 45) and 2-anilino-4-(1-ethylimidazol-5-yl)pyrimidine (Method 32; Example 43).

Ex R¹ R² NMR M/z 42 n-Pr

0.74(t, 3H), 1.70(m, 2H), 2.86(q, 2H), 3.15 (s, 3H), 3.29(m, 2H), 4.69(t, 2H), 7.40(d, 1H), 7.55(t, 1H), 7.72(d, 2H), 7.87(d, 2H), 8.50(s, 1H), 8.67(d, 1H), 9.28(s, 1H), 10.17 (s, 1H) 417 43 Et

1.04(t, 3H), 1.38(t, 3H), 2.84(m, 2H), 3.30 (m, 4H), 4.74(q, 2H), 7.40(d, 1H), 7.55(m, 1H), 7.74(d, 2H), 7.89(d, 2H), 8.55(s, 1H), 8.68(d, 1H), 9.40(s, 1H), 10.20(s, 1H) 417 44 n-Pr

0.72(t, 3H), 1.05(t, 3H), 1.70(sext, 2H), 2.85 (q, 2H), 3.31(q, 4H), 4.69(t, 2H), 7.38(d, 1H), 7.51(t, 1H), 7.71(d, 2H), 7.85(d, 2H), 8.47(s, 2H), 8.66(d, 1H), 9.25(s, 1H), 10.16 (s, 1H) 431 45 n-Pr

0.73(t, 3H), 1.50(m, 2H), 1.73(m, 4H), 2.73 (m, 2H), 3.55(q, 1H), 3.67(q, 1H), 3.80(quin, 1H), 4.70(t, 1H), 7.38(d, 1H), 7.55(t, 1H), 7.71(d, 2H), 7.85(d, 2H), 8.50(s, 2H, 8.67 (d, 1H), 9.30(s, 1H), 10.17(s, 1H) 443

Example 46 4-(1-Ethylimidazol-5-yl)-2-{4-[N-(cyclopropyl)sulphamoyl]anilino}pyrimidine

Chlorosulphonic acid (250 μl, 3.6 mmol) was added dropwise to solution of 2-anilino-4-(1-ethylimidazol-5-yl)pyrimidine (Method 32; 250 mg, 0.9 mmol) in thionyl chloride (5 ml) cooled at 0° C. and the mixture stirred at 0° C. for 10 minutes then heated at 90° C. for 90 minutes. The volatiles were removed by evaporation and the residue was dried under high vacuum (<2 mmHg) for 1 hour. The resulting solid was placed under nitrogen and a solution of cyclopropylamine (1 ml, 13.5 mmol) in MeOH (4m1) added. The mixture was stirred for 15 minutes and the volatiles were evaporated in vacuo. Water (20m1) was added and the resultant solid was washed with water (2×10 ml), ether (2×10 ml) and dried under vacuum at 60° C. for 18 hr. The resultant solid was dissolved in MeOH (4 ml) and treated with 1M HCl in ether (0.62 ml, 0.62 mmol). The solvent was evaporated in vacuo and the resultant solid triturated with ether, collected by filtration and dried under vacuum at 60° C. to yield the title compound (220 mg, 56%) as a golden solid. NMR: 0.34 (m, 2H), 0.52 (m, 2H), 1.52 (t, 3H), 2.21 (m, 1H), 4.77 (q, 2H), 7.43 (d, 1H), 7.74 (m, 3H), 7.93 (d, 2H), 8.54 (s, 1H), 8.72 (d, 1H), 9.41 (s, 1H), 10.20 (brs, 1H); m/z 385.

Examples 47-64

The following compounds were prepared by the procedure of Example 46 using the appropriate starting materials.

Ex R¹ R² R³ R⁴ NMR M/z SM 47¹ Me Me H

1.04(t, 3H), 2.40(s, 3H), 2.88(q, 2H), 3.32(m, 4H), 3.96(s, 3H), 7.18(d, H), 7.44(t, 1H), 7.68(s, 1H), 7.70(d, 2H), 7.92(d, 2H), 8.44(d, 1H), 9.92(s, 1H) 417 Meth 34 48¹ Me Me H

1.15(s, 9H), 2.38(s, 3H), 3.97(s, 3H), 7.19(d, 1H), 7.24(s, 1H), 7.63(s, 1H), 7.76(d, 2H), 7.88(d, 2H), 8.42(d, 1H), 9.87(s, 1H) 401 Meth 34 49^(1,2) Me Me H

0.74(t, 3H), 1.05(s, 3H), 1.45(q, 2H), 2.40(s, 3H), 3.95(s, 3H), 7.22-7.18(m, 2H), 7.65(s, 1H), 7.70(d, 2H), 7.91(d, 2H), 8.45(d, 1H), 9.90(s, 1H) 415 Meth 34 50¹ Me Me H

2.39(s, 3H), 3.12(q, 2H), 3.96(s, 3H), 4.15(t, 2H), 6.19(s, 1H), 7.20(d, 1H), 7.40(s, 1H), 7.58(t, 1H), 7.68-7.62(m, 4H), 7.92(d, 2H), 8.43(d, 1H), 9.92(s, 1H) 439 Meth 34 51¹ Me Me H

0.89(d, 3H), 2.40(s, 3H), 3.08(t, 2H), 3.96(s, 3H), 4.60(s, 1H), 7.22(dd, 2H), 7.74(m, 3H), 7.92 (d, 2H), 8.43(d, 1H), 9.90(s, 1H) Meth 34 52^(1,3) Me Me H

2.39(s, 3H), 3.08-3.00(m, 2H), 3.32-3.22(m, 2H), 3.60-3.44(m, 1H), 3.98(s, 3H), 4.50(t, 2H), 7.14(d, 1H), 7.20(d, 1H), 7.64(s, 1H), 7.73(d, 2H), 7.90(d, 2H), 8.44(d, 1H), 9.89(s, 1H) 419 Meth 34 53¹ Me Me H

0.9(d, 3H), 2.38(s, 3H), 3.25-3.06 (m, 6H), 3.97(s, 3H), 7.20(d, 1H), 7.40(d, 1H), 7.64(s, 1H), 7.72(d, 2H), 7.92(d, 2H), 8.43(d, 1H), 9.89(s, 1H) 417 Meth 34 54 i-Pr H H

0.34(m, 2H), 0.52(m, 2H), 1.52 (d, 6H), 2.21(m, 1H), 5.81(m, 1H), 7.43(d, 1H), 7.74(m, 3H), 7.92(d, 2H), 8.52(s, 1H), 8.71(d, 1H), 9.54(s, 1H), 10.20(brs, 1H) 399 Meth 33 55 i-Pr H H

1.52(d, 6H), 2.86(m, 2H), 3.16(s, 3H), 3.28(m, 2H), 5.79(m, 1H), 7.38(d, 1H), 7.55(m, 1H), 7.72 (d, 2H), 7.86(d, 2H), 8.52(s, 1H), 8.68(d, 1H), 9.58(s, 1H), 10.20 (brs, 1H) 417 Meth 33 56 i-Pr H H

1.50(m, 7H), 1.75(m, 3H), 2.86 (m, 2H), 3.55(m, 1H), 3.66(m, 1H), 3.78(m, 1H), 5.80(m, 1H), 7.38(d, 1H), 7.53(m, 1H), 7.72 (d, 2H), 7.86(d, 2H), 8.52(s, 1H), 8.68(d, 1H), 9.58(s, 1H), 10.19 (brs, 1H) 443 Meth 33 57⁴ i-Pr Me H

1.52(d, 6H), 2.39(s, 3H), 3.18(s, 3H), 2.79(s, 3H), 5.58(m, 1H), 7.28(d, 1H), 7.30(bm t, 1H), 7.69 (d, 2H), 7.89(d, 2H), 8.20(s, 1H) 8.70(d, 1H), 10.20(s, 1H), 15.00 (v bms, 0.7H) 387 Meth 31 58⁵ Et H H

1.40(t, 3H). 2.90(q, 2H), 3.15(s, 3H), 3.3(t, 2H), 4.75(q, 2H), 7.4 (d, 1H), 7.5(t, 1H), 7.73(d, 2H), 7.9(d, 2H), 8.5(s, 1H), 8.7(d, 1H), 9.30(s, 1H) 403 Meth 32 59^(1,6) Me Me H

1.00(s, 6H), 2.37(s, 3H), 3.17(d, 2H), 3.95(s, 3H), 4.68(t, 1H), 7.0 (s, 1H), 7.17(d, 1H), 7.63(s, 1H), 7.73(d, 2H), 7.87(d, 2H), 8.43(d, 1H), 9.87(s, 1H) 417 Meth 34 60¹ Me Me F

2.37(s, 3H), 2.93(t, 2H), 3.17(s, 3H), 3.28(t, 2H), 3.84(s, 3H), 7.2 (d, 1H), 7.6(m, 3H), 7.67(s, 1H), 8.08(t, 1H), 8.38(d, 1H), 9.4(s, 1H) 421 Meth 35 61^(1,5) Me Me F NH₂ 2.35(s, 3H), 3.85(s, 3H), 7.2(d, 363 Meth 1H), 7.35(s, 2H), 7.62(m, 3H), 35 8.07(t, 1H), 8.4(d, 1H), 9.35(s, 1H) 62 i-Pr Me H NH₂ 1.47(d, 6H), 2.49(s, 3H), 5.68 373 Meth (sept, 1H), 7.13(m, 3H), 7.43(s, 31 1H), 7.72(d, 2H), 7.85(d, 2H), 8.44(d, 1H), 9.81(s, 1H) 63 n-Pr H H

0.38(m, 2H), 0.43(m, 2H), 0.75 (t, 3H), 1.70(m, 2H), 2.10(s, 1H), 4.71(t, 2H), 7.40(d, 1H), 7.74(d, 3H), 7.92(d, 2H), 8.51(s, 1H), 8.69(d, 1H), 9.30(s, 1H), 10.20 (s, 1H) 399 Meth 36 64 n-Pr Me H

0.37(m, 2H), 0.46(m, 2H), 0.69 (m, 3H), 1.61(m, 2H), 2.11(m, 1H), 2.73(s, 3H), 4.69(t, 2H), 7.36(d, 1H), 7.74(m, 3H), 7.91 (d, 2H), 8.47(s, 1H), 8.66(d, 1H), 10.25(s, 1H) 413 Meth 37 ¹Isolated as free base ²Purified by flash silica chromatography DCM:MeOH (90:10) ³Purified by flash silica chromatography DCM:MeOH (85:15) ⁴Purified by flash silica chromatography DCM:MeOH (95:5 increasing in polarity to 90:10) ⁵Purified by Isolute amine column ⁶i-PrOH used in place of MeOH

Example 65 2-{4-[N-(1-Morpholino-2-methylprop-2-yl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine

2-[4-(2,2-Dimethylaziridin-1-ylsulphonyl)anilino]-4-(1,2-dimethylimidazol-5-yl)pyrimidine (Example 47; 200 mg, 0.502 mmol) was dissolved on warming in morpholine (4.7 ml, excess) and stirred at room temperature for 3 days. The excess morpholine was removed in vacuo and the residue dissolved in EtOAc (40 ml) and washed with water (3×40 ml), dried the solvent evaporated in vacuo. The crude product was triturated with ether filtered washed with ether and air-dried to give the title compound (200 mg, 82%) as a white solid. NMR 1.03 (s, 6H), 2.27 (s, 2H), 2.38 (s, 3H), 2.47 (m, 4H), 3.52 (m, 4H), 3.95 (s, 3H), 7.05 (s, 1H), 7.2 (d, 1H), 7.63 (s, 1H), 7.72 (d, 2H), 7.88 (d, 2H), 8.43 (d, 1H), 9.86 (s, 1H); m/z 486.

Example 66

Example 66 was prepared by the procedure of Example 65 using the appropriate starting material Ex Compound NMR m/z 66² 2-{4-[N-(1-Pyrrolidin-1-yl-2- 1.03(s, 6H), 1.62(m, 4H), 2.35(s, 3H), 470 methylprop-2-yl)sulphamoyl] 2.42(s, 2H), 2.53(m, 4H), 3.93(s, 3H), anilino}-4-(1,2-dimethylimidazol- 6.95(s, 1H), 7.18(d, 1H), 7.63(s, 1H), 5-yl)pyrimidine 7.73(d, 2H), 7.87(d, 2H), 8.43(d, 1H), 9.86(s, 1H)

Example 67 4-(1-Isopropyl-2-methylimidazol-5-yl)-2-{4-[N-(2-ethoxyethyl)sulphamoyl]anilino}pyrimidine

To a stirred solution of 2-amino-4-(1-isopropyl-2-methylimidazol-5-yl)pyrimidine (Method 39; 163 mg, 0.75 mmol), N-(2-ethoxyethyl)-4-iodobenzenesulphonamide (Method 44; 400 mg, 1.13 mmol), tris(dibenzylideneacetone) dipalladium (0) (35 mg, 0.038 mmol) and 2,2′-bis(diphenylphosphino)-1,1′-binaphthyl (47 mg, 0.076 mmol) in dioxane (10 ml) was added sodium t-butoxide (258 mg, 2.69 mmol) and the mixture heated at 80° C. overnight. The reaction was cooled to room temperature and MeOH 105 ml) was added and the mixture poured onto an Isolute SCX-2 column, eluted first with MeOH (10×30 ml) and the product was then eluted with 5% methanolic ammonia (10×30 ml). The solvent was removed by evaporation and the residue purified by flash chromatography on silica gel eluting with DCM/MeOH (100:0 increasing in polarity to 97:3) to yield a foam which was dissolved in MeOH (2 ml) and treated with 1N HCl in ether (350 μl, 0.35 mmol) for 5 minutes. Solvent was evaporated in vacuo to yield a yellow foam which was triturated with ether to yield after filtration the title compound as a yellow solid (141 mg, 39%) NMR: 1.05 (t, 3H), 1.53 (d, 6H), 2.80 (s, 3H), 2.85 (q, 2H), 3.32 (m, 4H), 5.58 (m, 1H),7.21 (d, 1H), 7.52 (t, 1H), 7.73 (d, 2H), 7.86 (d, 2H), 8.39 (s, 1H), 8.68 (d, 1H), 10.18 (brs, 1H); m/z 445.

Examples 68-76

The following compounds were prepared by the procedure of Example 67 using the appropriate starting materials.

Ex R¹ R² NMR M/z SM 68² i-Pr MeO(CH₂)₃— 1.57(d, 6H), 1.78(m, 2H), 2.81(s, 434 Meth 3H), 3.18(s, 3H), 3.28(m, 2H), 3.36 39 (m, 2H), 5.58(m, 1H), 7.30(d, 1H), Meth 7.82(d, 2H), 7.99(d, 2H), 8.22(s, 69 1H), 8.78(d, 1H), 10.32(s, 1H) 69³ i-Pr Me 1.52(d, 6H), 2.79(s, 3H), 3.14(s, 372 Meth 3H), 5.56(m, 1H), 7.28(d, 1H), 7.83 39⁷ (d, 2H), 7.96(d, 2H), 8.20(s, 1H), 8.71(d, 1H), 10.28(s, 1H) 70⁴ i-Pr Me₂N(CH₂)₃— 1.52(d, 6H), 1.98(m, 2H), 2.68(s, 443 Meth 9H), 3.09(t, 2H), 3.38(t, 2H), 5.58 39 (m, 1H), 7.25(d, 1H), 7.81(d, 2H), Meth 7.98(s, 1H), 7.99(d, 2H), 8.65(d, 65 1H), 10.25(s, 1H), 10.53(brs, 0.7H) 71⁵ i-Pr n-Bu 0.82(t, 3H), 1.30(m, 2H), 1.49(m, 414 Meth 2H), 1.51(d, 6H), 2.80(s, 3H), 3.22 39 (m, 2H), 5.54(m, 1H), 7.29(d, 1H), Meth 7.79(d, 2H), 7.96(d, 2H), 8.20(s, 67 1H), 8.71(d, 1H), 10.29(s, 1H), 15.10 (v brs, 0.7H) 72⁶ i-Pr CF₃—(CH₂)₂— 1.52(d, 6H), 2.58(m, 2H), 2.80(s, 454 Meth 3H, 3.55(m, 2H), 5.56(m, 1H), 7.30 39 (d, 1H), 7.89(d, 2H), 8.00(d, 2H), Meth 8.22(s, 1H), 8.76(d, 1H), 10.36(s, 66 1H), 15.50(v brs, 0.7H) 73¹ Me

1.05(s, 6H), 2.37(s, 3H), 3.1(s, 5H), 3.95(s, 3H), 7.18(d, 1H), 7.22(s, 1H), 7.63(s, 1H), 7.76(d, 2H), 7.88 (d, 2H), 8.43(d, 1H), 9.86(s, 1H) 431 Meth 40 Meth 43 74 i-Pr

1.54(d, 6H), 1.75(m, 2H), 1.93(m, 2H), 2.79(s, 3H), 3.45(t, 2H), 3.52 (m, 1H), 3.60(q, 1H), 4.04(quin, 1H), 5.57(sept, 1H), 7.29(d, 2H), 7.79(d, 2H), 7.94(d, 2H), 8.21(s, 1H), 8.72 (d, 1H), 10.29(s, 1H) 442 Meth 39 Meth 48 75 i-Pr EtO(CH₂)₃— 1.06(t, 3H), 1.55(d, 6H), 1.76(m, 444 Meth 2H), 2.82(s, 3H), 3.25(m, 2H), 3.34 39 (m, 4H), 5.59(sept, 1H), 7.30(d, 1H), Meth 7.82(d, 2H), 7.99(d, 2H), 8.21(s, 49 1H), 8.73(d, 1H), 10.32(s, 1H) 76 i-Pr

0.11(m, 2H), 0.40(m, 2H), 0.91(m, 1H), 1.53(d, 6H), 1.80(s, 3H), 2.87 (m, 2H), 3.14(d, 2H), 3.35(t, 2H), 5.57(m, 1H), 7.25(d, 1H), 7.55(t, 1H), 7.72(d, 2H), 7.88(d, 2H), 8.20 (s, 1H), 8.69(d, 1H), 10.18(s, 1H) 471 Meth 39 Meth 47 ¹Isolated as free base ²Purified by flash silica chromatography (DCM:MeOH 98:2): ammoma (100:0 increasing in polarity to 99:1) Residues was further purified by flash silica chromatography DCM:MeOH (96:4) ³Purified by flash silica chromatography DCM:MeOH (98:2 increasing in polarity to 90:10) ⁴Purified by flash silica chromatography DCM:MeOH/NH₃ (1% v/v) (95:5 increasing in polarity to 85:15) ⁵Purified by flash silica chromatography DCM:MeOH (97:3 increasing in polarity to 95:5) ⁶Purified by flash silica chromatography DCM:MeOH (95:5) ⁷The other intermediate was 4-bromo-phenyl methyl sulphone (commercially available)

Example 77 4-(1,2-Dimethylimidazol-5-yl)-2-{4-[N-(1,3-dimethoxyprop-2-yl)sulphamoyl]anilino}pyrimidine

Chlorosulphonic acid (230 μl, 3.31 mmol) was added to a solution of the 2-anilino-4-(1,2-dimethylimidazol-5-yl)pyrimidine (Method 34; 300 mg, 1.12 mmol) in thionyl chloride (6 ml) at 5° C. The mixture was stirred at 5° C. for 30 minutes, room temperature for 1 hour and heated at reflux for 1.5 hour. The mixture was allowed to cool to room temperature and a solution of excess 1,3-dimethoxy-2-aminopropane (Method 59) in ethanol (20 ml) and dimethylethylamine (0.5 ml) were added to the residue, and the mixture stirred at room temperature for 18 hours. The volatiles were removed by evaporation. The residue was triturated with water and the solid product collected by filtration and dried under vacuum at 60° C. The residue was purified by flash silica chromatography DCM:MeOH (95:5) to give the title compound. NMR: 2.40 (s, 3H), 3.10 (s, 6H), 3.20.(d, 4H), 3.32-3.28 (m, 1H), 3.98 (s, 3H), 7.20 (d, 1H), 7.55 (d, 1H), 7.65 (s, 2H), 7.74 (d, 2H), 7.90 (d, 2H), 8.44 (d, 2H), 9.89 (s, 1H); m/z 447

Examples 78-80

The following compounds were prepared by the procedure of Example 77 using the appropriate amine.

Ex R¹ NMR M/z 78²

0.9(d, 3H), 1.0(t, 3H), 2.38(s, 3H), 3.14-3.08(m, 1H), 3.31-3.20(m, 4H), 3.97(s, 3H), 7.19(d, 1H), 7.38(d, 1H), 7.63(s, 1H), 7.7(d, 2H), 7.90(d, 2H), 8.43(d, 1H), 9.91(s, 1H) 431 79^(3,1)

0.02(t, 2H), 0.25(t, 2H), 0.75(s, 3H), 2.08(s, 3H), 3.64(s, 3H), 6.90(d, 2H), 7.31(s, 1H), 7.38(d, 2H), 7.45(s, 1H), 7.60(d, 2H), 8.10(d, 1H), 9.60(s, 1H) 399 80⁴

0.79(t, 3H), 0.89(d, 3H), 1.40(q, 2H), 2.39(s, 3H)., 3.12-3.08(m, 1H), 3.23-3.18(m, 4H), 3.96(s, 3H), 7.20(d, 2H), 7.40(d, 1H), 7.64(s, 1H), 7.75(d, 2H), 7.92(d, 2H), 8.41 (d, 1H), 9.90(s, 1H) 445 ¹Startmg Material: Method 52 ²Purified by flash silica chromatography DCM:MeOH (96:4); starting material: Method 60 ³Purified by flash silica chromatography DCM:MeOH (93:7) ⁴Purified by flash silica chromatography DCM:MeOH (97:3); starting material: Method 61

Example 81 2-{4-[N-(1-Methylthio-2-methylprop-2-yl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine

2-[4-(2,2-Dimethylaziridin-1-ylsulphonyl)anilino]4-(1,2-dimethylimidazol-5-yl)pyrimidine (Example 47; 200 mg, 0.50 mmol) was dissolved in dry DMF (10 ml) and NaSMe (176 mg, 2.51 mmol) added as a solid. The mixture was stirred under inert gas at room temperature overnight. Acetic acid (150 μl, 2.62 mmol) was added and volatiles were evaporated vacuo. The residue was treated with EtOAc (30 ml)/water (30 mL) and the suspension filtered and the solid washed with water and dried. The crude product was triturated with MeOH, filtered, washed with MeOH and dried to give the title compound (205 mg, 75%) as a white solid; NMR 1.10 (s, 6H), 2.06 (s, 3H), 2.37 (s, 3H), 2.62 (2, 2H), 3.95 (s, 3H), 7.2 (d, 1H), 7.35 (s, 1H), 7.63 (s, 1H), 7.73 (d, 2H), 7.87 (d, 2H), 8.43 (d, 1H), 9.86 (s, 1H), ml/z 447.

Example 82

The following compound was prepared by the procedure of Method 80 using Method 72 as a starting material. Ex Compound NMR m/z 82 5-Bromo-4-(1-isopropyl-2- 1.44(d, 6H), 2.78(s, 3H), 2.87(q, 2H), 3.15(s, 509 methylimidazol-5-yl)-2-{4-[N- 3H), 3.28(t, 2H), 5.76(m, 1H), 7.59(t, 1H), (2-methoxyethyl)sulphamoyl] 7.71(d, 2H), 7.87(d, 2H), 8.01(s, 1H), 8.96(s, anilino}pyrimidine 1H), 10.52(s, 1H), 14.50(v brs, 0.7H)

Example 83 5-Cyano-4-(1-ethyl-2-methylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine

A suspension of 5-bromo-4-(1-ethyl-2-methylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine (Method 80; 0.35 g, 0.70 mmol), zinc cyanide (0.05 g, 0.42 mmol), tris(dibenzylideneacetone)dipalladium(0) (0.02 g, 0.02 mmol) and 1,1′-bis(diphenylphosphino)ferrocene (0.03 g, 0.05 mmol) in DMF (7 ml, 0.1M) was degassed (N₂ purge), then heated at 120° C. for 48 h. The mixture was cooled and filtered through diatomaceous earth, then concentrated in vacuo and the residue was purified by flash silica chromatography DCM:MeOH (97:3) to give the title compound as a yellow oil (80 mg, 26%). NMR 1.22 (t, 3H), 2.52 (s, 3H), 3.15 (q, 2H), 3.27 (s, 3H), 3.42 (t, 2H), 4.41 (q, 2H), 5.08 (t, 1H), 7.75 (d, 1H), 7.83 (d, 1H), 7.90 (s, 1E), 8.18 (s, 1H), 8.68 (s, 1H); m/z 442.

Example 84 2-[4-(2,2-Dimethylaziridin-1-ylsulphonyl)anilino]-4-(1,2-dimethylimidazol-5-yl)pyrimidine

To a solution of 2-{4-[N-(1-(4-toluenesulphonyloxy)-2-methylprop-2-yl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine (Method 81; 2.14 g, 3.75 mmol) in acetone (73 ml) was added powdered anhydrous potassium carbonate (0.57 g, 4.13 mmol). The mixture was heated at reflux for 4 hours. The reaction mixture was allowed to cool filtered and the solid washed with acetone. The filtrate was evaporated to give the title compound (1.36 g, 91%) as a white solid. NMR 1.42 (s, 6H), 2.37 (s, 3H), 2.43 (s, 2H), 3.95 (s, 3H), 7.20 (d, 1H), 7.63 (s, 1H), 7.77 (d, 2H), 7.95 (d, 2H), 8.43 (d, 1H), 10.0 (s, 1H), m/z 399.

Example 85 2-[4-(Benzylsulphonyl)anilino]-4-(1-isopropyl-2-methylimidazol-5-yl)pyrimidine

100 vol. Hydrogen peroxide (0.3 ml) was added to a solution of 2-[4-(benzylthio)anilino]-4-(1-isopropyl-2-methyliniidazol-5-yl)pyrimidine (Method 50; 160 mg, 0.39 mmol) in glacial acetic acid (2 ml) and the mixture heated at 60-70° C. for one hour. Further hydrogen peroxide (0.3 ml) was added and heating continued for a further 30 minutes. The mixture was diluted and cooled by adding crushed ice and then the solvent was removed by evaporation. The residue was partitioned between DCM (60 ml), saturated aqueous sodium hydrogen carbonate solution (15 ml) and water (10 ml). The organic layer was separated and the aqueous layer re-extracted with DCM (25 ml). The organic extracts were combined, washed with water (20 ml) and brine (15 ml), dried and the volatiles removed by evaporation. The residue was purified by chromatography on silica eluting with DCM/MeOH (98:2). The purified free base product (55 mg) was dissolved in MeOH (3 ml), and 1M HCl in ether (140 μl) added. The volatiles were evaporated and the triturated with ether to give the title compound (53 mg). NMR: 1.52 (d, 6H), 2.80 (s, 3H), 4.61 (s, 2H), 5.58 (m, 1H), 7.19 (m, 2H), 7.31 (m, 4H), 7.60 (d, 2H), 7.90 (d, 2H), 8.21 (s, 1H), 8.74 (d, 1H), 10.30 (s, 1H), 15.00 (br s, 1H); m/z 448.

Example 86 4-(1-Isopropyl-2-methylimidazol-5-yl)-2-[4-(3-morpholinopropylsulphonyl)anilino]pyrimidine

A solution of water (0.5 ml) and oxone (400 mg) was added to a solution of 4-(1-isopropyl-2-methylimidazol-5-yl)-2-[4-(3-morpholinopropylthio)anilino]pyrimidine (Method 85; 260 mg, 0.58 mmol) in MeOH (2.5 ml) and acetone (0.5 ml). The mixture was stirred for 4 hours, a solution of sodium metabisulphite (250 mg) in water (1 ml) was added and the mixture stirred for a further 20 minutes. The volatiles were removed by evaporation. Water (10 ml) was added to the residue and saturated aqueous sodium hydrogen carbonate solution added to basify the solution. The aqueous solution was extracted with EtOAc (2×25 ml), the extracts combined, washed with brine (10 ml), dried and evaporated. The residue was purified by chromatography on silica eluting with DCM/MeOH (98:2 increasing in polarity to 92:8). The purified product was dissolved in methanol (4 ml), 1M ethereal hydrogen chloride (270 μl) added and the volatiles removed by evaporation. The residue was triturated with ether to give the title compound (120 mg, 43%). NMR: 1.52 (d, 6H), 1.98 (br t, 2H), 2.62 (s, 3H), 2.88-3.00 (br m, 6H), 3.33 (t, 2H), 3.77 (br s, 4H), 5.53 (sept, 1H), 7.20 (d, 1H), 7.69 (s, 1H), 7.81 (d, 2H), 7.98 (d, 2H), 8.58 (d, 1H), 9.77 (s, 1H); m/z 485.

Example 87 5-Bromo-4-(1-isopropyl-2-methylimidazol-5-yl)-2-(4-mesylanilino)pyrimidine

Bromine (50 μl, 0.94 mmol) was added to a solution of 4-(1-isopropyl-2-methylimidazol-5-yl)-2-(4-mesylanilino)pyrimidine (Example 69; 350 mg, 0.94 mmol) in glacial acetic acid (3.5 ml). The mixture was heated at 60° C. for 140 minutes and the volatiles were then removed by evaporation. The residue was azeotroped with water to give a gum, which was then triturated with EtOAc to give a solid (470 mg). This crude product was purified by chromatography on silica gel eluting with DCM/MeOH (98:2 increasing in polarity to 95:5). The purified product was triturated with EtOAc to give the title compound (125 mg, 30%) as a solid. NMR: 1.39 (d, 6H), 2.48 (s, 3H), 3.12 (s, 3H), 4.68 (sept, 1H), 7.20 (s, 1H), 7.81 (d, 2H), 7.92 (d, 2H), 8.79 (s, 1H), 10.28 (br s, 1H); m/z 450.

Example 88 4-(1-Isopropyl-2-methylimidazol-5-yl)-2-{4-[N-(2-carboxymethyl)sulphamoyl]anilino}pyrimidine

4-(1-Isopropyl-2-methylimidazol-5-yl)-2-{4-[N-(2-methyloxycarbonylmethyl) sulphamoyl]anilino}pyrimidine (Example 41; 90 mg, 0.203 mmol) was added to a stirred solution of lithium hydroxide monohydrate (9.4 mg, 0.23 mmol) in water (5 ml) and MeOH (5 ml). The mixture was stirred at ambient temperature for 18 hours then the volatiles were removed by evaporation. The crude solid residue was dissolved in MeOH (10 ml) and 1M ethereal hydrogen chloride (508 μl, 0.508 mmol) was added and the volatiles removed by evaporation to give the title compound hydrochloride (1:1 mixture with lithium chloride) (104 mg, 100%) as a yellow solid. NMR: 1.51 (d, 6H), 2.82 (s, 3H), 3.51 (s, 2H), 5.64 (m, 1H), 7.27 (d, 1H), 7.69 (d, 2H), 7.90 (d, 2H), 8.23 (s, 1H), 8.67 (s, 1H), 10.29 (s, 1H); m/z 431.

An Example of Process e)—an Alternative Synthesis of Example 69 4-(1-Isopropyl-2-methylimidazol-5-yl)-2-[4-(methylsulphonyl)anilino]pyrimidine

Titanium isopropoxide (188 μl, 0.62 mmol) was added to a mixture of 4-(1-isopropyl-2-methylimidazol-5-yl)-2-[4-(methylthio)anilino]pyrimidine (Method 86; 700 mg, 2.06 mmol) in butyl acetate (4.9 ml) and the mixture was heated to 50° C. Cumene hydroperoxide (800 μl, 4.32 mmol) was added over 40 minutes and the mixture was allowed to cool to 20° C. The resulting precipitate was collected by filtration, washed with butyl acetate and dried at 50° C. under vacuum to give the title compound (331 mg, 42%).

Preparation of Starting Materials

The starting materials for the examples above are either commercially available or are readily prepared by standard methods from known materials. For example, the following reactions are an illustration, but not a limitation, of some of the starting materials used in the above reactions.

Methods 1-21

The following compounds were synthesised by the procedure as described in JOC 1987, 2714-2716. Meth Compound NMR m/z SM 1 4-(Isopropylamino)-5- (CDCl₃) 1.12(d, 6H), 141 4-amino-5- methylisoxazole 2.30(s, 3H), 3.21(1H, methylisoxazole sept), 8.01(s, 1H) 2 5-Methyl-4-(N- (CDCl₃) 1.02(brs, 6H), 183 Meth 1 isopropylacetamido) 1.80(s, 3H), 2.38(s, isoxazole 3H), 4.99(1H, sept), 8.09(s, 1H) 3 5-Acetyl-1-isopropyl-2- 1.40(d, 6H), 2.38(s, 167 Meth 2 methylimidazole 3H), 2.42(s, 3H), 5.08(brm, 1H), 7.81(s, 1H) 4 5-Methyl-4-(N- 2.00(s, 3H), 2.34(s, 141 4-amino-5- acetamido)isoxazole 3H), 8.64(s, 1H), 9.60(brs, methylisoxazole 1H) hydrochloride 5 5-Methyl-4- 1.21(t, 3H), 2.58(s, 127 Meth 4 (ethylamino)isoxazole 3H), 3.22(q, 2H), 8.76(s, hydrochloride 1H) 6 5-Methyl-4-(N- 0.96(t, 3H), 1.77(s, 169 Meth 5 ethylacetamido)isoxazole 3H), 2.36(s, 3H), 3.52(q, 2H), 8.70(s, 1H) 7 5-Acetyl-1-ethyl-2- 1.30(t, 3H), 2.40(m, 153 Meth 6 methylimidazole 6H), 4.30(q, 2H), 7.64(s, 1H) 8 5-Methyl-4-(N- Used crude Meth 5 ethylforimido)isoxazole 9 5-Acetyl-1-ethylimidazole 1.23(t, 3H), 2.48(s, Meth 8 3H), 4.27(q, 2H), 7.86(s, 1H), 7.92(s, 1H) 10 5-Methyl-4-(N- Used crude Meth 1 isopropylformido)isoxazole 11 5-Acetyl-1- 1.38(d, 6H), 2.48(s, 153 Meth 10 isopropylimidazole 3H), 5.13(q, 2H), 7.86(s, 1H), 8.10(s, 1H) 12 5-Methyl-4-(N- 1.05(t, 3H), 2.28(q, 153 4-amino-5- propionylamido)isoxazole 2H), 2.35(s, 3H), 8.65(s, (M − H)⁻ methylisoxazole 1H), 9.50(s, 1H) hydrochloride 13 5-Methyl-4- 0.90(t, 3H), 1.62(m, 141 Meth 12 (propylamino)isoxazole 2H), 2.53(s, 3H), 3.10(t, 2H), 8.68(s, 1H) 14 5-Methyl-4-(N- 0.82(m, 3H), 1.42(m, 167 Meth 13 propylformido)isoxazole 2H), 2.28 & 2.38(s, (M − H)⁻ 3H), 3.50(m, 2H), 8.08 & 8.23(2s, 1H), 8.62 & 8.72(s, 1H) 15 5-Acetyl-1-propylimidazole 0.76(t, 3H), 1.63(m, 153 Meth 14 2H), 2.40(s, 3H), 4.28(t, 2H), 7.90(s, 1H), 7.95(s, 1H) 16 5-Methyl-4-(N- 0.91(t, 3H), 1.50(m, 183 4-amino-5- propylacetamido)isoxazole 2H), 1.88(s, 3H), 2.40(s, methylisoxazole 3H), 3.52(t, 2H), hydrochloride 8.15(s, 1H) 17 5-Acetyl-2-methyl-1- 0.83(t, 3H), 1.60(m, 167 Meth 16 propylimidazole 2H), 2.38(s, 6H), 4.19(dd, 2H), 7.83(s, 1H) 18 5-Methyl-4-(N-(2- 1.07(d, 6H), 1.35(s, 169 4-amino-5- methylpropionyl)amido)isoxazole 3H), 1.57(m, 1H), 8.65(s, methylisoxazole 1H), 9.47(s, 1H) hydrochloride 19 5-Methyl-4- 0.96(d, 6H), 1.95(m, 155 Meth 18 (isobutylamino)isoxazole 1H), 2.52(s, 3H), 2.99(d, 2H), 8.68(s, 1H) 20 5-Methyl-4-[N- 0.81(d, 6H), 1.60(m, 197 Meth 19 (isobutyl)acetamido]isoxazole 1H), 1.77 & 2.12(s, 3H), 2.24 & 2.36(s, 3H), 3.32(m, 2H), 8.55 & 8.69(s, 1H) 21 5-Acetyl-1- 0.78(d, 6H), 1.90(m, 181 Meth 20 (isobutyl)imidazole 1H), 2.32(s, 3H), 2.36(s, 3H), 4.03(d, 2H), 7.83(s, 1H)

Method 22 5-(3-Dimethylaminoprop-2-en-1-oyl)-1,2-dimethylimidazole

2-Methyl-4-acetylimidazole (Tetrahedron letters 1985, 26 (29), 3423-3426; 129 g, 1.04 mol) was dissolved in a mixture of DMF (900 ml) and DMF.DMA (1.51) and the mixture heated under reflux, under an atmosphere of nitrogen, for 18 hours. The reaction mixture was allowed to cool to ambient temperature the product crystallised. The solid product was collected by filtration, washed with DMF.DMA and then ether and dried under vacuum at 40° C. to give the title compound (115 g, 57%) as a pale brown crystalline solid. NMR: 2.13 (s, 3H), 2.95 (s, 6H), 3.78 (s, 3H), 5.56 (d, 1H), 7.50 (d, 1H), 7.53 (s, 1H); m/z 194.

Methods 23-29

The following compounds were synthesised by the procedure of Method 22. Meth Compound NMR m/z SM 23¹ 5-(3-Dimethylaminoprop-2- 1.17(t, 3H), 2.16(s, 3H), 2.95(s, 208 Meth 7 en-1-oyl)-1-ethyl-2- 6H), 4.27(q, 2H), 5.57(d, 1H), methylimidazole 7.50(d, 1H), 7.53(s, 1H) 24² 5-(3-Dimethylaminoprop-2- 1.43(d, 6H), 2.40(s, 3H), 2.95(brs, 222 Meth 3 en-1-oyl)-1-isopropyl-2- 6H), 3.31(s, 3H), 5.22(sept, methylimidazole 1H), 5.54(d, 1H), 7.48(s, 1H), 7.52(d, 1H) 25 5-(3-Dimethylaminoprop-2- 1.23(t, 3H), 2.95(m, 6H), 4.31(q, 194 Meth 9 en-1-oyl)-1-ethylimidazole 2H), 5.60(d, 1H), 7.55(d, 1H), 7.62(s, 1H), 7.76(s, 1H) 26 5-(3-Dimethylaminoprop-2- 1.43(d, 6H), 2.95(m, 6H), 5.32(m, ND Meth 11 en-1-oyl)-1- 1H), 5.58(d, 1H), 7.60(m, 2H), isopropylimidazole 7.90(s, 1H) 27 5-(3-Dimethylaminoprop-2- 0.75(t, 3H), 1.65(m, 2H), 2.95(br 208 Meth 15 en-1-oyl)-1-propylimidazole s, 6H), 4.25(t, 2H), 5.62(d, 1H), 7.55(d, 1H), 7.64(s, 1H), 7.66(s, 1H) 28 5-(3-Dimethylaminoprop-2- 0.80(t, 3H), 1.58(m, 2H), 2.32(s, 222 Meth 17 en-1-oyl)-1-propyl-2- 3H), 2.95(br s, 6H), 4.22(dd, 2H), methylimidazole 5.58(d, 1H), 7.50(d, 1H), 7.54(s, 1H) 29 5-(3-Dimethylaminoprop-2- 400 MHz: 0.78(d, 6H), 1.92(m, 236 Meth 21 en-1-oyl)-1-(isobutyl)-2- 1H), 2.31(s, 3H), 2.95(br s, 6H), methylimidazole 4.12(d, 2H) 5.57(d, 1H), 7.52(d, 1H), 7.57(s, 1H) ¹Only DMF.DMA used as solvent ²Purified by flash chromatography on silica gel eluting with DCM/MeOH(98:2 increasing in polarity to 92.5:7.5)

Method 30 2-Anilino-4-(1-ethyl-2-methylimidazol-5-yl)pyrimidine

5-(3-Dimethylaminoprop-2-en-1-oyl)-1-ethyl-2-methylimidazole (Method 23; 2.10 g, 10.1 mmol), phenylguanidine hydrogen carbonate (2.2 g, 11.1 mmol) and sodium methoxide (1.2 g, 22.2 mmol) were suspended in anhydrous DMA (15 ml) and the mixture heated at 110° C. for 18 hours. The reaction mixture was allowed to cool to ambient temperature and poured into water (50 ml). The solution was extracted EtOAc (2×50 ml). The combined extracts were washed with water (2×50 ml) and then brine (2×50 ml), dried and the volatiles removed by evaporation. The residue was triturated with ether, collected by filtration and air dried to give the title compound (1.48 g, 53%) as a reddish brown solid. NMR 1.17 (t, 3H), 2.38 (s, 3H), 4.52 (q, 2H), 6.93 (t, 1H), 7.08 (d, 1H), 7.27 (t, 2H), 7.60 (s, 1H),7.62 (d, 2H), 8.35 (d, 1H), 9.35 (s, 1H); m/z 280.

Methods 31-38

The following compounds were synthesised by the procedure of Method 30. Meth Compound NMR m/z SM 31¹ 2-Anilino-4-(1-isopropyl-2- 1.44(d, 6H), 2.51(s, 3H), 294 Meth methylimidazol-5- 5.72(septuplet, 1H), 6.99(t, 1H), 24 yl)pyrimidine 7.04(d, 1H), 7.30(t, 2H), 7.42(s, 1H), 7.67(d, 2H), 8.39(d, 1H), 9.42(s, 1H) 32 2-Anilino-4-(1-ethylimidazol- 1.21(t, 3H), 4.55(q, 2H), 6.96(t, 266 Meth 5-yl)pyrimidine 1H), 7.16(d, 1H), 7.29(t, 2H), 25 7.62(d, 2H), 7.70(s, 1H), 7.86(s, 1H), 8.38(d, 1H), 9.40(s, 1H) 33 2-Anilino-4-(1- 1.21(d, 6H), 5.65(m, 1H), 6.96(t, 280 Meth isopropylimidazol-5- 1H), 7.12(d, 1H), 7.29(t, 2H), 26 yl)pyrimidine 7.63(m, 3H), 8.04(s, 1H), 8.38(d, 1H), 9.40(s, 1H) 34² 2-Anilino-4-(1,2- 2.37(s, 3H), 3.93(s, 3H), 6.95(t, 266 Meth dimethylimidazol-5- 1H), 7.08(d, 1H), 7.28(t, 2H), 22 yl)pyrimidine 7.59(s, 1H), 7.69(d, 2H), 8.35(d, 1H), 9.43(s, 1H) 35 2-(2-Fluoroanilino)-4-(1,2- 2.33(s, 3H), 3.75(s, 3H), 7.07(d, 284 Meth dimethylimidazol-5- 1H), 7.17(m, 3H), 7.58(s, 1H), 22 yl)pyrimidine 7.65(t, 1H), 8.30(d, 1H), 9.02(s, Meth 1H) 70 36 2-Anilino-4-(1- 0.68(t, 3H), 1.55(m, 2H), 4.48(t, 280 Meth propylimidazol-5- 2H), 6.97(t, 1H), 7.14(d, 1H), 27 yl)pyrimidine 7.30(t, 2H), 7.63(d, 2H), 7.73(s, 1H), 7.88(s, 1H), 8.38(d, 1H), 9.40(s, 1H) 37 2-Anilino-4-(2-methyl-1- 0.62(t, 3H), 1.50(m, 2H), 2.38(s, 294 Meth propylimidazol-5- 3H), 4.46(t, 2H), 6.98(t, 1H), 7.06(d, 28 yl)pyrimidine 1H), 7.28(t, 2H), 7.55-7.65(m, 3H), 8.35(d, 1H), 9.36(s, 1H) 38 2-Anilino-4-[1-(2- 400 MHz: 0.63(d, 6H), 1.70(m, 308 Meth methylpropyl)-2- 1H), 2.37(s, 3H), 4.36(d, 2H), 29 methylimidazol-5- 6.95(t, 1H), 7.08(d, 1H), 7.29(t, yl]pyrimidine 2H), 7.60(s, 1H), 7.64(d, 2H), 8.35(d, 1H), 9.40(s, 1H). ¹Solid crystallised from EtOAc ²Recrystallized from MeOH

Method 39 2-Amino-4-(1-isopropyl-2-methylimidazol-5-yl)pyrimidine

5-(3-Dimethylaminoprop-2-en-1-oyl)-1-isopropyl-2-methylimidazole (Method 24; 4.9 g, 22.2 mmol) and guanidine hydrochloride (5.3 g, 55.6 mmol) were suspended in 1-butanol (70 ml). NaOMe (4.8 g, 88 mmol) was added in one portion and the mixture heated under reflux, under an atmosphere of nitrogen, for 3 hours. The volatiles were removed by evaporation. Water (50 ml) was added and extracted EtOAc (3×50 ml). The organic layers were combined and dried evaporated in vacuo. The residue triturated with isohexane to give the title compound as a brown solid (1.9 g, 40%). NMR: 1.46 (d, 6H), 2.43 (s, 3H), 5.45 (m, 1H), 6.50 (brs, 1H), 6.74 (d, 1H), 7.28 (s, 1H), 8.12 (d, 1H); m/z218

Method 40

The following compounds were synthesised by the procedure of Method 39. Meth Compound NMR m/z SM 40 2-Amino-4-(1,2- 2.16(s, 3H), 3.93(s, 3H), 6.52(s, 190 Meth dimethylimidazol- 2H), 6.80(d, 1H), 7.47(s, 1H), 22 5-yl)pyrimidine 8.17(d, 1H)

Method 41 N-(1,1-Dimethyl-2-(4-iodosulphonyloxy)-ethyl)-4-iodosulphonamide

2-Amino-2-methyl-1-propanol (1.34 g, 15 mmol) was dissolved in dry pyridine and cooled to 0° C. under inert gas. Pipsyl chloride (9.52 g, 31.5 mmol) was added in portions as a solid keeping temperature <2° C. The stirred a further 10 minutes at 0° C. and then at room temperature for 18 hr. The reaction mixture was poured into vigorously stirred ice water and the pH adjusted to 1.0 using conc. HCl. The precipitated solid was filtered washed with water and dried to give the title compound (7.03 g, 75%) as a brown solid; NMR (CDCl₃) 1.29 (s, 6H), 3.93 (s, 2H), 4.76 (s, 1H), 7.55 (m, 4H), 7.82 (d, 2H), 7.73 (d, 2H).

Method 42 2,2-Dimethylaziridin-1-yl-4-iodosulphonamide

To a stirred solution of N-(1,1-dimethyl-2-(4-iodosulphonyloxy)-ethyl)-4-iodosulphonamide (Method 41; 7.0 g, 11.27 mmol) in acetone (112 ml) was added powdered anhydrous potassium-carbonate (1.71 g, 12.4 mmol). The mixture was heated at reflux for 20 hours and left standing at room temperature for 2 days. The reaction mixture was filtered and the solid washed with acetone. The filtrate was evaporated in vacuo. The crude product was purified by flash silica chromatography DCM:isohexane (3:1) to give the title compound (3.36 g, 88%) as a white solid. NMR (CDCl₃) 1.53 (s, 6H), 2.43 (s, 2H), 7.63 (d, 2H), 7.85 (d, 2H); m/z 337.

Method 43 N-(1,1-Dimethyl-2-methoxyethyl)-4-iodosulphonamide

To a stirred solution of 2,2-dimethylaziridin-1-yl-4-iodosulphonamide (Method 42; 3.35 g, 9.94 mmol) in dry THF (100 ml), under inert gas atmosphere was added rapidly NaOMe (2.68 g, 49.7 mmol. The suspension was heated at reflux under inert gas for 6 hours. The reaction mixture was allowed to cool and then poured onto a stirred-mixture of distilled water and acetic acid (3.2 ml, 22.4 mmol). Ether (100 ml) was added, washed with water (100 ml), dried and the solvent evaporated in vacuo. The crude product was triturated with ether/isohexane, filtered, washed with i-hexane and dried to give the title compound (2.44 g, 67%) as a white solid. NMR 1.03 (s, 6H), 3.07 (s, 3H), 3.1 (s, 2H), 7.55 (m, 3H), 7.93 (d, 2H); m/z 370.

Method 44 N-(2-Ethoxyethyl)-4-iodobenzenesulphonamide

2-Ethoxyethylamine (2.14 g, 24 mmol) and diisopropylethylamine (4.2 ml, 24 mmol) were dissolved in DCM (50 ml) and cooled to 0° C. To this was added pipsyl chloride (6.05 g, 20 mmol) in portions and the reaction stirred for 18 hours. Volatiles were evaporated in vacuo. The residue was dissolved in EtOAc (50 ml), washed with 0.33M citric acid (2×50 ml), brine (50 ml), dried and evaporated in vacuo to yield an oil which solidified on standing to give the title compound as a pale yellow solid (6.97 g, 98%). NMR: 1.01 (t, 3H), 2.89 (q, 2H), 3.30 (m, 4H), 7.53 (d, 2H), 7.75 (t, 1H), 7.97 (d, 2H); m/z 354 (M−H)⁻.

Method 45 N-(2-Hydroxyethyl)-4-iodobenzenesulphonamide

The title compound was prepared by the procedure of Method 44 using the appropriate starting materials. NMR: 2.79 (t, 2H), 3.35 (m, 2H), 4.62 (t, 1H), 7.55 (d, 2H), 7.62 (s, 1H), 7.98 (d, 2H); m/z 326 (M−H)⁻.

Method 46 N-(2-methansulphonyloxyethyl)-4-iodobenzenesulphonamide

Diisopropylethylamine (585 μl, 3.36 mmol) followed by methane sulphonyl chloride (260 μl, 3.36 mmol) was added to a stirred solution of N-(2-hydroxyethyl)-4-iodobenzenesulphonamide (Method 45; 1 g, 3.06 mmol) in EtOAc (25 ml) at 5° C., under nitrogen. The reaction was allowed to warm to ambient temperature and stirred for 24 hours. The reaction mixture was washed with 1M hydrochloric acid (3×25 ml), saturated aqueous sodium hydrogen carbonate solution (3×25 ml), brine (2×25 ml), an then dried. The volatiles were removed by evaporation and the residue purified by chromatography on silica, eluting with DCM/MeOH (100:0 increasing in polarity to 99:1) to give the title compound (562 mg, 45%) as a white solid. NMR: 3.08 (m, 2H), 3.12 (s, 3H), 4.08 (t, 2H), 7.55 (d, 2H), 7.98 (d, 2H), 8.03 (t, 1H); m/z 405.

Method 47 N-(2-Cyclopropylmethoxyethyl)-4-iodobenzenesulphonamide

Sodium hydride (136 mg of a 60% suspension in mineral oil, 3.39 mmol) was slowly added to a stirred solution of cyclopropylmethanol (275 μl, 3.39 mmol) in DMF (8 ml), at 0° C. under nitrogen. The mixture was stirred for 20 minutes, then a solution of N-(2-methansulphonyloxyethyl)-4-iodobenzenesulphonamide (Method 46; 550 mg, 1.36 mmol) in DMF (6 ml) was slowly added and the reaction allowed to warm to ambient temperature and stirred for 18 hours. The volatiles were removed by evaporation and water (30 ml) added to the residue. The aqueous solution was extracted with EtOAc (3×20 ml), the extracts were combined washed with water (3×40 ml), brine (2×30 ml), dried and volatiles removed by evaporation. The residue was purified by chromatography on silica eluting with DCM/MeOH (100:0 increasing in polarity to 99:1) to give the title compound (328 mg, 74%) as a colourless oil, which solidified upon standing. NMR: 0.09 (m, 2H), 0.40 (m, 2H), 0.89 (m, 1H), 2.90 (m, 2H), 3.11 (d, 2H), 3.33 (t, 2H), 7.55 (d, 2H), 7.77 (t, 1H), 7.96 (d, 2H); m/z 380 (M−H)⁻.

Method 48 1-(Tetrahyrofur-2-ylmethylsulphonyl)-4-bromobenzene

4-Bromothiophenol (1.9 g, 10 mmol) and potassium carbonate (1.5 g, 11 mmol) were stirred in acetone (40 ml). Tetrahydrofurfurylbromide (2 g, 12mmol) was added dropwise, and the mixture was then heated at 45° C. for 2 hours. The mixture was allowed to cool, the insolubles removed by filtration and the filter pad washed with acetone. The volatiles were removed from the filtrate by evaporation to give crude 1-(2-tetrahyrofurylmethylthio)-4-bromobenzene (3.1 g) an oil (m/z 273). This crude product was dissolved in methanol (60 ml) and water (10 ml). Oxone (8 g) added in portions and the mixture stirred for 2.5 hours. Water (20 ml) was added and the methanol was removed by evaporation. Further water (20 ml) was added to the aqueous residue, which was then extracted with DCM (2×50 ml). The extracts were combined, washed with brine (15 ml), dried and the solvent evaporated. The residue was purified by chromatography on silica eluting with DCM/isohexane/EtOAc (10:8:2) to give the title compound (1.7 g, 56%) as a solid. NMR (CDCl₃): 1.56 (m, 1H), 1.88 (m, 2H), 2.13 (m, 1H), 3.20 (dd, 1H), 3.39 (dd, 1H), 3.72 (m, 2H), 4.26 (m, 1H), 7.68 (d, 2H), 7.79 (d, 2H); m/z 305.

Method 49 1-(3-Ethoxypropylsulphonyl)-4-bromobenzene

1-Bromo-3-ethoxypropane (2.2 g, 13.3 mmol) was treated as described in the Method 48 to give the title compound (2.9 g, 71%). NMR (CDCl₃): 1.12 (t, 3H), 1.98 (m, 2H), 3.20 (m, 2H), 3.42 (m, 4H), 7.70 (d, 2H), 7.78 (d, 2H); m/z 307.

Method 50 2-[4-(Benzylthio)anilino]-4-(1-isopropl-2-methylinidazol-5-yl)pyrimidine

The title compound was prepared by the procedure of Example 67 using the appropriate starting materials. NMR: 1.48 (d, 6H), 2.77 (s, 3H), 4.12 (s, 2H), 5.58 (m, 1H), 7.14 (m, 1H), 7.20 (m, 1H), 7.28 (m, 6H), 7.59 (d, 2H), 8.18 (s, 1H), 8.61 (d, 1H), 9.79 (s, 1H); m/z 416.

Method 51 1-(1-Methylcyclopropane)carboxamide

Oxalyl chloride (8.24 ml, 0.095 mol) and then DMF (few drops) were added to a solution of 1-(1-methylcyclopropane)carboxylic acid (9.42 g, 0.094 mol) in DCM (150 ml) cooled at 5° C. and the mixture stirred at 5° C. for 30 minutes and then for 3 hours at ambient temperature. The solvent and excess oxalyl chloride were removed by evaporation, the residue dissolved in DCM and added to a solution of ammonia (excess) in MeOH cooled at 5° C. The mixture was allowed to warm to ambient temperature and the volatiles removed by evaporation to give the title compound. NMR: 0.29 (q, 2H), 0.71 (q, 2H), 1.02 (s, 3H), 6.62 (s, 1H), 6.85 (s, 1H).

Method 52 1-Amino-1-methylcyclopropane

Bromine (2.87 ml, 0.056 mol) was added to a solution of sodium hydroxide (13.5 g, 0.338 mol) in water (100 ml) at 0-5° C. A slurry of 1-(1-methylcyclopropane)carboxamide (Method 51; 5.70 g 0.056 mol) in water (50 ml) was then added and reaction mixture stirred at 5° C. for 2 hours, then left to stand at ambient temperature for 24 hours. The mixture was then heated at 80° C. for 2.5 hours, allowed to cool and mixture distilled to give the title compound (bp 75-80° C.). NMR: 0.2 (q, 2H), 0.14 (q, 2H), 0.96 (s, 3H), 1.42 (s, 2H).

Method 53 1,3-Dimethoxy-2-methanesulphonyloxypropane

To a solution of 1,3-dimethoxy-2-hydroxypropane (3.84 g, 0.032 mol) in DCM (70 ml) cooled at 5° C. was added triethylamine (5 ml, 0.036 mol) followed by slow addition of methanesulphonyl chloride (2.72 ml, 0.035 mol). The mixture was then stirred at ambient temperature for 24 hours. The mixture was then absorbed onto silica gel and purified by flash silica chromatography DCM:isohexane (3:1) to give the title compound (3.74 g, 59%). NMR 3.15 (s, 3H), 3.28 (s, 6H), 3.52 (d, 4H), 4.78 (q, 1H).

Methods 54-55

The following compounds were prepared by the procedure of Method 53 using the appropriate starting materials. Meth Compound NMR 54 1-Ethoxy-2- 1.10(t, 3H), 1.28(d, 3H), 3.14(s, methanesulphonyloxypropane 3H), 3.42-3.48(m, 2H), 3.65(m, 2H), 4.78(q, 1H) 55 1-Propoxy-2- 0.86(t, 3H), 1.28(d, 3H), 1.51(q, methanesulphonyloxypropane 2H), 3.33-3.40(m, 2H), 3.44(d, 2H),3.69(d, 3H), 4.78(q, 1H)

Method 56 1,3-Dimethoxy-2-azidoitropane

1,3-Dimethoxy-2-methanesulphonyloxypropane (Method 53; 3.74 g, 19 mmol) and sodium azide (2.03 g, 31 mmol) in DMA (55 ml) was heated at 100° C. for 8 hours then left to stand at ambient temperature for 24 hours. The mixture was diluted with water, extracted with EtOAc, the extracts combined and washed with water, dried and the volatiles removed by evaporation to give the title compound (2.0 g, 74%) as a clear oil.

Methods 57-58

The following compounds were prepared by the procedure of Method 56 using the appropriate starting materials. Meth Compound SM 57 1-Ethoxy-2-azidopropane Method 54 58 1-propoxy-2-azidopropane Method 55

Method 59 1,3-Dimethoxy-2-aminopropane

10% Palladium on charcoal (500 mg) was added to a solution of 1,3-dimethoxy-2-azidopropane (Method 56; 2 g, 0.014 mol) in ethanol (40 ml) and the mixture stirred under an atmosphere of hydrogen at ambient temperature for 6 hours. The catalyst was removed by filtration through diatomaceous earth and the filter pad washed with ethanol to give a solution of the title compound in ethanol (20 ml).

Methods 60-61

The following compounds were prepared by the procedure of Method 59 using the appropriate starting materials. Meth Compound SM 60 1-Ethoxy-2-aminopropane Method 57 61 1-propoxy-2-aminopropane Method 58

Method 62 1-[3-(N,N-Dimethylaminopropylthio]-4-bromobenzene

3-(Dimethylamino)propyl chloride hydrochloride (3.48 g, 22 mmol) was added in portions to a suspension of 4-bromothiophenol (3.78 g, 20 mmol) and potassium carbonate (5.52 g, 40 mmol) in DMF (40 ml) and the reaction mixture heated to 60° C. for 15 minutes. The mixture was allowed to cool to ambient temperature and poured into water (100 ml) and extracted with EtOAc (2×100 ml). The extracts were combined, washed with brine (3×100 ml), dried (Chemelut column 1010) and evaporated to give the title compound (5.25 g, 96%) as a pale yellow oil. NMR 1.76 (m, 2H), 2.20 (s, 6H), 2.35 (t, 2H), 2.93 (t, 2H), 7.18 (d, 2H), 7.38 (d, 2H); m/z 276.

Method 63 1-(3,3,3-Trifluoropropylthio)-4-bromobenzene

3-Bromo-1,1,1-trifluoropropane (640 μl, 6 mmol) was added to a mixture of 4-bromothiophenol (945 mg, 5 mmol) and potassium carbonate (760 mg, 5.5 mmol) in DMF (5 ml) and the reaction mixture heated at 40° C. for 1 hour. The mixture was allowed to cool to ambient temperature and poured into water (50 ml) and extracted with EtOAc (2×30 ml). The extracts were combined, washed with brine (3×30 ml), dried (Chemelut column 1010) and evaporated to give the title compound (1.36 g, 95%) as a pale yellow oil. NMR 2.56 (m, 2H), 3.13 (t, 2H), 7.31 (d, 2H), 7.51 (d, 2M); m/z 285 (M⁺).

Method 64 1-(1-Butylthio)-4-bromobenzene

The title compounds was synthesised in an analogous method to Method 63. NMR 0.85 (t, 3H), 1.38 (m, 2H), 1.51 (m, 2M), 2.96 (t, 2H), 7.23 (d, 2H), 7.46 (d, 2H); m/z 244 (M⁺).

Method 65 1-[3-(N,N-Dimethylamino)propylsulphonyl]-4-bromobenzene

Oxone (14 g, 23 mmol) was added to a solution of 1-[3-(N,N-dimethylamino) propylthio]-4-bromobenzene (Method 62; 5.24 g, 19.1 mmol) in MeOH (150 ml) and water (30 ml) and the mixture was stirred at ambient temperature for 90 minutes. The reaction mixture was poured onto an Isolute SCX-2 column, washed MeOH (6×40 ml) and the product eluted with 2% methanolic ammonia (10×40 ml). The solvent was evaporated and residue purified by flash chromatography on silica gel eluting with DCM/2% methanolic ammonia (100:0 increasing in polarity to 94:6) to yield the title compound (4.68 g, 80%) as a pale yellow oil. NMR 1.62 (m, 2H), 2.03 (s, 6H), 2.19 (t, 2H), 3.32 (m, 2H), 7.81 (m, 4H); m/z 306.

Method 66 1-(3,3,3-Trifluoropropylsulphonyl)-4-bromobenzene

Oxone (3.7 g, 6 mmol) was added to a solution of 1-(3,3,3-trifluoropropylthio)-4-bromobenzene (Method 63; 1.36, 4.75 mmol) in MeOH (25 ml) and water (5 ml) and the mixture was stirred at ambient temperature for 18 hours. The MeOH evaporated and water (20 ml) added and the mixture extracted with DCM. The extracts were dried (Chemelut column CE1005) and solvent removed by evaporation to give the title compound (1.43 g, 95%) as a white solid. NMR 2.62 (m, 2H), 3.67 (m, 2H), 7.86 (s, 4H); m/z 316 (M⁺).

Method 67 1-(1-Butylsulphonyl)-4-bromobenzene

The title compound was synthesised from Method 64 in an analogous method to Method 66. NMR: 0.80 (t, 3H), 1.31 (m, 2H), 1.47 (m, 2H), 3.29 (t, 2H), 7.78 (d, 2H), 7.86 (d, 2H); n/z 276 (M⁺).

Method 68 3-Methoxy-1-propanol methanesulphonate

Methanesulphonyl chloride (1.75 ml, 22 mmol) was added to a solution of 3-methoxy-1-propanol (1.81 g, 20 mmol) and triethylamine (3.35 ml, 24 mmol) in DCM (40 ml) cooled in an ice bath and the mixture stirred at ambient temperature for 18 hours. DCM (25 ml) and water (50 ml) were added and the phases separated and the aqueous layer was extracted with DCM (25 ml). The extracts were combined, washed with water (50 ml) and brine (50 ml), dried (Chemelut column CE1010) and evaporated to give the title compound 3.25 g (97%) as a pale yellow oil. NMR 2.00 (m, 2H), 3.01 (s, 3H), 3.35 (s, 3H), 3.49 (t, 2H), 4.38 (t, 2H).

Method 69 1-(3-Methoxypropylsulphonyl)-4-bromobenzene

Potassium carbonate (2.8 g, 20 mmol) was added to a solution-of 3-methoxypropan-1-yl methansulphonate (Method 68; 3.25 g, 19.3 mmol) and 4-bromothiophenol (3.48 g, 18.4 mmol) in DMF (30 ml) and the mixture heated at 40° C. for 4 hours. The mixture was allowed to cool to ambient temperature, poured into water (100 ml) and extracted with EtOAc (2×50 ml). The extracts were combined, washed with saturated aqueous sodium hydrogen carbonate solution (50 ml) and brine (2×50 ml), dried (Chemelut column CE1010) and the volatiles removed by evaporation. The residue was dissolved in MeOH (150 ml) and water (30 ml) and oxone (13.4 g, 21.6 mmol) was added in portions. The mixture was stirred at ambient temperature for 18 hours. The MeOH was evaporated, water (50 ml) added and the solution extracted with DCM (3×50 ml). The extracts were combined, washed with brine (50 ml), dried (Chemelut column CE1010), and evaporated. The residue was purified by flash chromatography on silica gel eluting with iso-hexane: EtOAc (100:0 increasing in polarity to 90:10) to give the title compound (3.32 g, 62%) as a colourless oil. NMR 1.95 (m, 2H), 3.19 (m, 2H), 3.26 (s, 3H), 3.41 (t, 2H), 7.70 (d, 2H), 7.78 (d, 2H).

Method 70 2-Fluorophenylguanidine Bicarbonate

Concentrated hydrochloric acid (6 ml) in water (4.8 ml) was added to a mixture of 2-fluoroaniline (7.94 g, 71.2 mmol) and cyanamide (6.98 g, 166 mmol) and the mixture heated at 115° C. for 2.5 hours. The reaction mixture was allowed to cool to ambient temperature and the solution was adjusted to pH 13 by careful addition of 40% aqueous sodium hydroxide solution. The aqueous solution was extracted with EtOAc and the combined organic extracts were dried (Na₂SO₄) and the volatiles removed by evaporation. The crude product was dissolved in water (40 ml) and carbon dioxide gas bubbled through the solution until the pH of the suspension remained constant (approximately pH 9). The precipitated solid was collected by filtration, washed sparingly with water and dried to give the title compound (11.95 g, 78%) as a white solid. NMR: 6.83 (m, 2H), 7.0 (m, 2H); m/z: 154.

Methods 71-72

The following compounds were prepared by the procedure of Example 46 using the appropriate starting materials.

Meth R¹ NMR M/z SM 71¹ Et 1.25(t, 3H), 2.40(s, 3H), 3.05(q, 2H), 3.20(s, 3H), 3.36(t, 2H), 417 Meth 4.43(q, 2H), 4.92(t, 1H), 6.95(d, 1H), 7.32(brs, 1H), 7.50(s, 30 30 1H), 7.72(m, 4H), 8.35(d, 1H) 72¹ i-Pr 1.48(d, 6H), 2.51(s, 3H), 2.86(m, 2H), 3.16(s, 3H), 3.29(t, 431 Meth 2H), 5.66(septuplet, 1H), 7.14(d, 1H), 7.46(s, 1H), 7.49(t, 1H), 31 7.69(d, 2H), 7.89(d, 2H), 8.45(d, 1H), 9.88(s, 1H)

Method 73 3-Hydroxyisoxazole

Hydroxylamine hydrochloride (35 g, 0.5 mol) was added to a solution of sodium hydroxide (58 g, 1.45 mol) in water (580 ml). MeOH (600 ml) followed by ethyl propiolate (38 ml, 0.37 mol) in portions was then added and the resulting solution stirred at ambient temperature for 6 days. The mixture was acidified to pH2 with concentrated hydrochloric acid and then saturated with sodium chloride. The solution was extracted with DCM (8×500 ml), the extracts combined, dried and the solvent evaporated. The solid residue was washed with hot iso-hexane (3×300 ml) and the final suspension was allowed to cool and the resulting solid was collected by filtration, dried under vacuum to give the title compound (11.16 g, 35%) as a white solid crystallised. NMR 6.04 (s, 1H), 8.43 (s, 1H), 11.16 (s, 11). m/z 85 (M⁺).

Method 74 Ethynylcarbamoyl

To liquid ammonia (300 ml) was added methyl propiolate (52.4 g, 0.62 mol) over 2 hours keeping the temperature at −70° C. The ammonia was left to evaporate and the reaction mixture evaporated in vacuo to yield the title compound (43 g) which was used without any further purification. Mpt: 54-55° C.

Method 75 3-Oxo-2,3-dihydro-1,2.5-thiadiazole

To a stirred solution of ethynylcarbamoyl (Method 74; 43 g, 0.62 mol) in water (310 ml) cooled in ice bath was added ammonium thiosulphate (92.35 g, 0.62 mol) in one portion. The reaction was allowed to warm to room temperature over 5 hours. To the reaction mixture was added a solution of iodine (79.2 g, 0.31 mol) in MeOH (11) rapidly over 10 minutes to yield a dark solution. Ammonium thiosuphate was added until a yellow solution was obtained. The solvent was evaporated to approximately 400 ml and extracted ether (3×300 ml). The ethereal solution was washed brine (100 ml), passed through phase separation paper and evaporated in vacuo to yield the title compound as a pale orange solid (32.8 g, 52%). Mpt: 70-71° C.

Method 76 3-[2-(t-Butoxycarbonylamino)ethoxy]-1,2,5-thiadiazole

Diisopropyl azodicarboxylate (1.1 ml, 5.5 mmol) was added dropwise to a solution of 2-(t-butoxycarbonyl amino)ethanol (850 μl, 5.5 mmol), 3-oxo-2,3-dihydro-1,2,5-thiadiazole (Method 75; 510 mg, 5 mmol) and triphenylphosphine (1.44 g, 5.5 mmol) in THF (20 ml) and the mixture was stirred at ambient temperature for 18 hours. The solvent was evaporated and the residue purified by flash chromatography on silica gel eluting with iso-hexane: EtOAc (100:0 increasing in polarity to 4:1) to give the title compound (1.17 g, 95%) as a white solid. NMR 1.38 (s, 9H), 3.31 (m, 2H), 4.16 (t, 2H), 6.96 (m, 1H), 8.35 (s, 1H); m/z 246.

Method 77

The following compound was synthesised in an analogous method to Method 76 using the appropriate amine and heterocycle as starting materials. Meth Compound NMR m/z SM 57 3-[3-(t- 1.36 (s, 9H), 1.80 (m, 2H), 243 Meth Butoxycarbonylamino) 3.04 (q, 2H), 4.17 (t, 2H), 73 propoxy]isoxazole 6.24 (s, 1H), 6.83 (m, 1H), 8.61 (s, 1H)

Method 78 3-(2-Aminoethoxy)-1,2,5-thiadiazole Hydrochloride

4M Hydrogen chloride in dioxane (10 ml) was added to a solution of 3-[2-(t-butoxycarbonylamino)ethoxy]-1,2,5-thiadiazole (Method 76; 1.17 g, 4.74 mmol) in dioxane (20 ml) and the mixture was stirred at ambient temperature for 2 days. The resulting solid was collected by filtration, washed with ether and dried to give the title compound (803 mg, 93%) as a white solid NMR 3.20 (m, 2H), 4.58 (t, 2H), 8.36 (m, 4H); m/z 146.

Method 79

The following compound was synthesised in an analogous method to Method 78. Meth Compound NMR m/z SM 79 3-(3-Aminopropoxy) 2.02 (m, 2H), 2.83 (m, 2H), 143 Meth isoxazole 4.24 (t, 2H), 6.29 (s, 1H), 77 hydrochloride 8.20 (s, 3H), 8.61 (s, 1H)

Method 80 5-Bromo-4-(1-ethyl-2-methylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine

Bromine (8 μl, 0.14 mmol) was added to a solution of 4-(1-ethyl-2-methylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine (Method 71; 52 mg, 0.13 mmol) in glacial acetic acid (2 ml) heated at 60° C. The mixture was heated at 60° C. for 4 hours, then the solvent was removed by evaporated. The residue was dissolved in DCM (20 ml), washed with saturated aqueous sodium hydrogen carbonate solution (20 ml), dried (Chemelut column 1005) and purified by flash chromatography eluting with DCM/2% methanolic ammonia (100:0 increasing in polarity to 97:3) to yield the title compound (37 mg, 60%) as a white foam NMR 1.25 (t, 3H), 2.50 (s, 3H), 3.15 (q, 2H), 3.26 (s, 3H), 3.42 (t, 2H), 4.33 (q, 2H), 4.92 (t, 1H), 7.40 (s, 1H), 7.71 (d, 2H), 7.82 (m, 3H), 8.61 (s, 1H); m/z 497.

Method 81 2-{4-[N-(1-(4-Toluenesulphonyloxy)-2-methylpro-2-yl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine

2-{4-[N-(1-Hydroxy-2-methylprop-2-yl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine (Example 59; 2.36 g, 5.66 mmol) was dissolved in dry pyridine (55 ml) and the solution stirred and cooled to 0° C. under inert gas. Solid p-toluenesulphonyl chloride (5.61 g, 29.4 mmol) was added portionwise over 2 minutes. The reaction was stirred at 0° C. for 10 minutes and then at room temperature for 18 hr. The reaction mixture was diluted with water (200 ml) and the precipitated oil allowed to settle out. The supernatant water layer was decanted off and the residual oil was washed with more water and this was decanted off. This process was repeated and then the oil partitioned between EtOAc (100 ml) and water (50 ml). The layers were separated and the organic layer washed with water (50 ml), dried and the solvent evaporated in vacuo to yield the title compound as a gum (1.94 g, 60%) NMR 1.0 (s, 6H), 2.36 (s, 3H), 2.38 (s, 3H), 3.77 (s, 2H), 3.93 (s, 3H), 7.20 (d, 1H), 7.43 (d, 2H), 7.55 (s, 1H), 7.65 (m, 5H), 7.87 (d, 2H), 8.45 (d, 1H), 9.9 (s, 1H); m/z 571.

Method 82 1-(3-Hydroxypropylthio)-4-nitrobenzene

3-Chloropropanol (6.0 g, 63.5 mmol) was added dropwise to a solution of 4-nitrothiophenol (8.2 g, 52.9 mmol) and sodium hydroxide (3.2 g) in water (120 ml) stirred and heated at 80° C. under nitrogen and the mixture heated at 80° C. for 205 minutes. The mixture was allowed to cool and then extracted with EtOAc (2×100 ml). The extracts were combined, washed with water (50 ml) and brine (50 ml), dried and evaporated to give the title compound (11.1 g, 98%). NMR (CDCl₃) 1.99 (m, 2H), 3.18 (t, 2H), 3.81 (m, 2H), 7.35 (d, 2H), 8.13 (d, 2H).

Method 83 4-(3-Hydroxypropylthio)aniline

Iron powder (330 mg) and conc. hydrochloric acid (0.3 ml) were added to a solution of 1-(3-hydroxypropylthio)-4-nitrobenzene (Method 82; 1 g, 4.69 mmol) in ethanol (6 ml) and water (3 ml). The mixture was stirred and heated at 90° C. for 3 hours, further iron powder (300 mg) and conc. HCl (0.2 ml) were added and heating continued for a further 2 hours. The volatiles were removed by evaporation and water (20 ml) added to the residue. The mixture was acidified to pH 1 with 2M hydrochloric acid, filtered through diatomaceous earth, and the filtrate washed with EtOAc (2×25 ml). The aqueous layer was basified to pH11 with conc. aqueous sodium hydroxide solution and extracted with EtOAc (2×25 ml). The extracts were combined, washed with brine (15 ml), dried and evaporated under reduced pressure to give the title compound (900 mg, 100%). m/z 184.

Method 84 4-(1-Isopropyl-2-methylimidazol-5-yl)-2-[4-(3-hydroxypropylthio)anilino]pyrimidine

2M Hydrochloric acid (10 ml) and cyanamide (500 mg) were added to a solution of 4-(3-hydroxypropylthio)aniline (Method 83; 900 mg) in ethanol (1 ml). The mixture was stirred under reflux for 19 hours and further 2M hydrochloric acid (0.5 ml) and cyanamide (400 mg) were added and heating continued for a further 6 hours. The volatiles were removed by evaporation, water (5 ml) was added to the residue and the mixture basified with concentrated sodium hydroxide solution to greater than pH11. The aqueous mixture was extracted with EtOAc (2×30 ml) washed with water (5 ml) and brine (10 ml). The organic extracts were combined, evaporated, and azeotroped with methanol to give crude 4-(3-hydroxypropylthio) phenylguanidine (880 mg) as a purple oil (m/z 226). This crude product was treated with 5-(3-dimethylaminoprop-2-en-1-oyl)-1-isopropyl-2-methylimidazole (Method 24; 400 mg, 1.81 mmol) as described in Method 30 to give the title compound (400 mg, 58%). NMR: 1.44 (d, 6H), 1.68 (m, 2H), 2.92 (t, 2H), 3.34 (s, 3H), 3.49 (m, 2H), 4.52 (t, 1H), 5.70 (sept, 1H), 7.05 (d, 1H), 7.30 (d, 2H), 7.42 (s, 1H), 7.64 (d, 2H), 8.39 (d, 1H), 9.51 (s, 1H); m/z 384.

Method 85 4-(1-Isopropyl-2-methylimidazol-5-yl)-2-[4-(3-morpholinopropylthio)anilino]pyrimidine

4-(1-Isopropyl-2-methylimidazol-5-yl)-2-[4-(3-hydroxypropylthio)anilino]pyrimidine (Method 84; 250 mg, 0.65 mmol) was suspended in DCM (8 ml) and acetonitrile (2 ml) and the stirred at room temperature under nitrogen. Triethylamine (100 μl) was added followed by dropwise addition of methane sulphonyl chloride (50 μl). The mixture was stirred for 2.5 hours and then allowed to stand for 18 hours. The volatiles were removed by evaporation, the residue dissolved in acetonitrile (5 ml), and morpholine (120 μl) and potassium carbonate (50 mg) were added. The mixture was stirred and heated at 80° C. for 3.5 hours and then the volatiles were removed by evaporation. The residue was partitioned between EtOAc (50 ml) and water (20 ml). The aqueous layer was basified to pH 9 with sodium bicarbonate solution. The phases separated and the aqueous layer re-extracted with EtOAc. The extracts were combined, washed with water (10 ml) and brine (10 ml), dried and then evaporated to give the title compound (260 mg, 88%) m/z 453.

Method 86 4-(1-Isopropyl-2-methylimidazol-5-yl)-2-[4-(methylthio)anilino]pyrimidine

A mixture of N-[4-(methylthio)phenyl]guanidine¹ (1 g, 5.5 mmol) and 5-(3-dimethylaminoprop-2-en-1-oyl)-1-isopropyl-2-methylimidazole (Method 24; 1.22 g, 5.5 mmol) in toluene (10 ml) was heated at reflux for 24 hours. The mixture was allowed to cool to 60° C., diluted with isohexane (10 ml) and then cooled to 5° C. The resulting precipitate was collected by filtration, washed with toluene/isohexane (1:1) and dried at 50° C. under vacuum to give the title compound (1.3 g, 70%). NMR: 1.51 (d, 6H), 2.45 (s, 3H), 2.73 (s, 3H), 5.53-5.66 (m, 1H), 7.12 (d, 1H), 7.26 (d, 2H), 7.64 (d, 2H) 8.00 (s, 1H), 8.58 (d, 1H), 9.70 (s, 1H); m/z 340. ¹See for example Alexandria Journal of Pharmaceutical Sciences (1988), 2(2) 130-2; Archive der Pharmazie (Weinheim, Germany) (1985), 318 (11), 1043-5; and Archive der Pharmazie (Weinheim, Germany) (1979), 312 (5), 426-31

Example 89

The following illustrate representative pharmaceutical dosage forms containing the compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof (hereafter compound X), for therapeutic or prophylactic use in humans: (a): Tablet I mg/tablet Compound X 100 Lactose Ph. Eur 182.75 Croscarmellose sodium  12.0 Maize starch paste (5% w/v paste)  2.25 Magnesium stearate  3.0 (b): Tablet II mg/tablet Compound X  50 Lactose Ph. Eur 223.75 Croscarmellose sodium  6.0 Maize starch  15.0 Polyvinylpyrrolidone (5% w/v paste)  2.25 Magnesium stearate  3.0 (c): Tablet III mg/tablet Compound X  1.0 Lactose Ph. Eur  93.25 Croscarmellose sodium  4.0 Maize starch paste (5% w/v paste)  0.75 Magnesium stearate  1.0 (d): Capsule mg/capsule Compound X  10 Lactose Ph. Eur 488.5 Magnesium stearate  1.5 (e): Injection I (50 mg/ml) Compound X  5.0% w/v 1M Sodium hydroxide solution 15.0% v/v 0.1M Hydrochloric acid (to adjust pH to 7.6) Polyethylene glycol 400  4.5% w/v Water for injection to 100% (f): Injection II 10 mg/ml Compound X  1.0% w/v Sodium phosphate BP  3.6% w/v 0.1M Sodium hydroxide solution 15.0% v/v Water for injection to 100% (g): Injection III (1 mg/ml, buffered to pH6) Compound X  0.1% w/v Sodium phosphate BP 2.26% w/v Citric acid 0.38% w/v Polyethylene glycol 400  3.5% w/v Water for injection to 100% Note

The above formulations may be obtained by conventional procedures well known in the pharmaceutical art. The tablets (a)-(c) may be enteric coated by conventional means, for example to provide a coating of cellulose acetate phthalate. 

1. A compound of the formula (IA), (IB), (IC), (ID), (IE) and (IF) of the generic structure of formula (I):

wherein: i) a compound of formula (IA) is selected from:

wherein: R¹ is 2-(pyrazolyl-1-yl)ethyl, 3-(isoxazol-3-yloxy)propyl, 2-(isothiazol-3-yloxy)ethyl, 2-(thiadiazol-3-yloxy)ethyl, 1,3-dihydroxyprop-2-yl, 1-methyl-1-hydroxymethylethyl, 1,1-dimethylpropyl, 1-methylcyclopropyl, t-butyl, 2-morpholino-1,1-dimethylethyl, 2-pyrrolidin-1-yl-1,1-dimethylethyl, 2-methylthio-1,1-dimethylethyl, 1,3-dimethoxyprop-2-yl, 1-methoxyprop-2-yl, 1-hydroxyprop-2-yl, 1-ethoxyprop-2-yl, 1-propoxyprop-2-yl, ethoxyethyl or 2-methoxy-1,1-dimethylethyl; and R² is hydrogen; or R¹ and R² together form 2,2-dimethylaziridin-1-yl; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; ii) a compound of formula (IB) is selected from:

wherein: R¹ is pyrid-2-ylmethyl, 2-(2-methyl-1,2,4-triazol-5-yl)ethyl, 2-pyrid-2-ylethyl, 2-pyridazin-3-ylethyl, 2-(3,5-dimethyltriazol-4-yl)ethyl, 2-pyrid-3-ylethyl, 2-methoxyethyl, 3-(5-methylpyrazol-4-yl)propyl, 2-trifluoromethylpyrid-5-ylmethyl, 2-pyridazin-4-ylethyl, 1,1-dimethylprop-2-ynyl, 2-ethoxyethyl, 2-phenoxyethyl, 2-(4-methoxyphenoxy)ethyl, 2-(2-methoxyphenoxy)ethyl, 2-(vinyloxy)ethyl, 2-(isopropoxy)ethyl and 2-(propoxy)ethyl; and R² is hydrogen or cyano; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; provided that when R¹ is 2-methoxyethyl, R² is cyano; iii) a compound of formula (IC) is selected from:

wherein: R¹ is hydrogen, heterocyclyl, C₁₋₆alkyl or C₁₋₆alkoxyC₁₋₆alkyl; wherein R¹ may be optionally substituted on carbon by one or more hydroxy, carboxy, C₁₋₆alkoxy, C₁₋₆alkoxycarbonyl, N,N-(C₁₋₆alkyl)₂amino, heterocyclyl, C₃₋₆cycloalkyl and C₁₋₆alkoxyC₁₋₆alkoxy; and wherein if a heterocyclyl contains an —NH— moiety, that nitrogen may be optionally substituted by C₁₋₆alkyl or benzyl; R² is hydrogen, halo or cyano; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof, provided that when R¹ is 2-methoxyethyl, cyclopropylmethyl or pyrid-2-ylmethyl, R² is not hydrogen; iv) a compound of formula (ID) is selected from:

wherein: R¹ is hydrogen, C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl; R² is hydrogen, halo or cyano; R³ is C₂₋₆alkyl; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; v) a compound of formula (IE) is selected from:

wherein: R¹ is hydrogen, C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl; R² is halo, cyano, C₁₋₃alkyl or C₁₋₃alkoxy; p is 1-2; wherein the values of R² may be the same or different; R³ is hydrogen, halo or cyano; R⁴ is C₁₋₄alkyl; R⁵ is C₁₋₆alkyl or C₂₋₆alkenyl; wherein R⁵ may be optionally substituted on carbon by one or more methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; provided that said compound is not 4-(1,2-dimethylimidazol-5-yl)-2-[2-methoxy-4-(N-methylsulphamoyl)-5-methylanilino]pyrimidine; vi) a compound of formula (IF) is selected from:

wherein: R¹ is C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, dimethylamino, 2,2,2-trifluoroethoxy, phenyl or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl; R² is halo, cyano, C₁₋₃alkyl or C₁₋₃alkoxy; p is 0-2; wherein the values of R² may be the same or different; R³ is hydrogen, halo or cyano; R⁴ is C₂₋₆alkyl; R⁵ is C₁₋₆alkyl or C₂₋₆alkenyl; wherein R⁵ may be optionally substituted on carbon by one or more methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, 2,2,2-trifluoroethoxy or cyclopropylmethoxy; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; vii) a compound of formula (IG) is selected from:

wherein: R¹ is C₁₋₄alkyl, C₂₋₄alkenyl, C₂₋₄alkynyl, C₃₋₆cycloalkyl, C₃₋₆cycloalkylC₁₋₃alkyl, a heterocyclyl or heterocyclylC₁₋₃alkyl; wherein R¹ may be optionally substituted on carbon by one or more methyl, ethyl, methoxy, ethoxy, propoxy, trifluoromethyl, trifluoromethoxy, dimethylamino, 2,2,2-trifluoroethoxy, phenyl or cyclopropylmethoxy; and wherein if said heterocyclyl contains an —NH— moiety that nitrogen may be optionally substituted by one or more methyl, ethyl, acetyl, 2,2,2-trifluoroethyl or methoxyethyl; R² is halo, cyano, C₁₋₃alkyl or C₁₋₃alkoxy; p is 0-2; wherein the values of R² may be the same or different; R³ is hydrogen, halo or cyano; R⁴ is n-propyl or C₄₋₆alkyl; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 2. A compound of formula (I) according to claim 1 which is a compound of formula (IA), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 3. A compound of formula (IA) selected from: 2-{4-[N-(2-ethoxyethyl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine; 2-{4-[N-(t-butyl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine; 2-{4-[N-(1-ethoxyprop-2-yl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine; 2-{4-[N-(1-propoxyprop-2-yl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine; and 2-{4-[N-(1-methylcyclopropyl)sulphamoyl]anilino}-4-(1,2-dimethylimidazol-5-yl)pyrimidine; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 4. A compound of formula (I) according to claim 1 which is a compound of formula (IB), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 5. A compound of formula (IB) selected from: 4-(1-ethyl-2-methylimidazol-5-yl)-2-{4-[N-(2-ethoxyethyl)sulphamoyl]anilino}pyrimidine; 2-{4-[N-(2-isopropoxyethyl)sulphamoyl]anilino}-4-(1-ethyl-2-methylimidazol-5-yl)pyrimidine; 2-{4-[N-(2-propoxyethyl)sulphamoyl]anilino}-4-(1-ethyl-2-methylimidazol-5-yl)pyrimidine; 2-{4-[N-(1,1-dimethylprop-2-ynyl)sulphamoyl]anilino}-4-(1-ethyl-2-methylimidazol-5-yl)pyrimidine; and 2-{4-[N-(2-vinyloxyethyl)sulphamoyl]anilino}-4-(1-ethyl-2-methylimidazol-5-yl)pyrimidine; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 6. A compound of formula (I) according to claim 1 which is a compound of formula (IC), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 7. A compound of formula (IC) according to claim 6, or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof, wherein R¹ is hydrogen, 2-methoxyethyl, methyl, 2-ethoxyethyl, 2-isopropoxyethyl, 2-propoxyethyl, 2-(cyclopropylmethoxy)ethyl, 3-(t-butoxy)propyl, 3-[2-(2-ethoxyethoxy)ethoxy]propyl, 3-(2-methoxyethoxy)propyl, carboxymethyl, t-butoxycarbonylmethyl, 2-hydroxyethyl, 2-(N-methylpyrrolidin-2-yl)ethyl, N-ethylpyrrolidin-2-ylmethyl, 2-pyrrolidin-1-ylethyl, 2-morpholinoethyl, 3-morpholinopropyl, N-benzylpiperidin-4-yl, 2-piperdin-1-ylethyl, 2-dimethylaminoethyl, 2-diethylaminoethyl or methoxycarbonylmethyl; and R² is hydrogen or bromo; provided that when R¹ is 2-methoxyethyl R² is not hydrogen.
 8. A compound of formula (IC) selected from: 4-(1-isopropyl-2-methylimidazol-5-yl)-2-{4-[N-(2-ethoxyethyl)sulphamoyl]anilino}pyrimidine; 4-(1-isopropyl-2-methylimidazol-5-yl)-2-{4-[N-(2-isopropoxyethyl)sulphamoyl]anilino}pyrimidine; 4-(1-isopropyl-2-methylimidazol-5-yl)-2-{4-[N-(2-propoxyethyl)sulphamoyl]anilino}pyrimidine; 4-(1-isopropyl-2-methylimidazol-5-yl)-2-(4-{N-[2-(cyclopropylmethoxy)ethyl]sulphamoyl}anilino)pyrimidine; and 4-(1-isopropyl-2-methylimidazol-5-yl)-2-{4-[N-(methyl)sulphamoyl]anilino}pyrimidine; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 9. A compound of formula (I) according to claim 1 which is a compound of formula (ID), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 10. A compound of formula (ID) according to claim 9, or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; wherein R¹ is cyclopropyl, 2-methoxyethyl, 2-ethoxyethyl or tetrahydrofur-2-ylmethyl; R² is hydrogen; and R³ is ethyl, propyl or isopropyl.
 11. A compound of formula (ID) selected from: 4-(1-isopropylimidazol-5-yl)-2-{4-[N-(cyclopropyl)sulphamoyl]anilino}pyrimidine; 4-(1-isopropylimidazol-5-yl)-2-{4-[N-(tetrahydrofur-2-ylmethyl)sulphamoyl]anilino}pyrimidine; 4-(1-propylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine; 4-(1-ethylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine; and 4-(1-isopropylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 12. A compound of formula (I) according to claim 1 which is a compound of formula (IE), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 13. A compound of formula (IE) according to claim 12, or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; wherein R¹ is hydrogen or 2-methoxyethyl; R² is fluoro; p is 1; R³ is hydrogen; and R⁴ is methyl.
 14. A compound of formula (IE) selected from: 2-{4-[N-(2-methoxyethyl)sulphamoyl]-2-fluoroanilino }-4-(1,2-dimethylimidazol-5-yl)pyrimidine; and 2-(4-sulphamoyl-2-fluoroanilino)-4-(1,2-dimethylimidazol-5-yl)pyrimidine; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 15. A compound of formula (I) according to claim 1 which is a compound of formula (IF), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 16. A compound of formula (IF) according to claim 15, or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; wherein R¹ is methyl, 3-dimethylaminopropyl, 3-methoxypropyl, 3,3,3-trifluoropropyl, butyl, benzyl, tetrahydrofur-2-ylmethyl, 3-ethoxypropyl or 3-morpholinopropyl; p is 0; R³ is hydrogen or bromo; R⁴ is isopropyl; and R⁵ is methyl.
 17. A compound of formula (IF) selected from: 4-(1-isopropyl-2-methylimidazol-5-yl)-2-(4-mesylanilino)pyrimidine; 4-(1-isopropyl-2-methylimidazol-5-yl)-2-[4-(tetrahydrofur-2-ylmethylsulphonyl)anilino]pyrimidine; 4-(1-isopropyl-2-methylimidazol-5-yl)-2-[4-(3-ethoxypropylsulphonyl)anilino]pyrimidine; 4-(1-isopropyl-2-methylimidazol-5-yl)-2-[4-(3-methoxypropylsulphonyl)anilino]pyrimidine; and 4-(1-isopropyl-2-methylimidazol-5-yl)-2-[4-(3-N,N-dimethylaminopropylsulphonyl)anilino]pyrimidine; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 18. A compound of formula (I) according to claim 1 which is a compound of formula (IG), or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 19. A compound of formula (IG) according to claim 18, or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof; wherein R¹ is 2-methoxyethyl, 2-ethoxyethyl or cyclopropyl; p is 0; R³ is hydrogen; and R⁴ is n-propyl or isobutyl.
 20. A compound of formula (IG) selected from: 4-(1-propyl-2-methylimidazol-5-yl)-2-{4-[N-(2-ethoxyethyl)sulphamoyl]anilino}pyrimidine; 4-(1-propyl-2-methylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine; 4-(1-propyl-2-methylimidazol-5-yl)-2-{4-[N-(cyclopropyl)sulphamoyl]anilino}pyrimidine; 4-(1-isobutyl-2-methylimidazol-5-yl)-2-{4-[N-(2-methoxyethyl)sulphamoyl]anilino}pyrimidine; and 4-(1-isobutyl-2-methylimidazol-5-yl)-2-{4-[N-(2-ethoxyethyl)sulphamoyl]anilino}pyrimidine; or a pharmaceutically acceptable salt or an in vivo hydrolysable ester thereof.
 21. A pharmaceutical composition which comprises a compound of formula (I), or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof, according to any one of claims 1-20, in association with a pharmaceutically-acceptable diluent or carrier. 22-32. (canceled)
 33. A method for producing a cell cycle inhibitory (anti-cell-proliferation) effect in a warm-blooded animal in need thereof, which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as claimed in claim
 1. 34. A method for the inhibition of CDK2, CDK4 or CDK6 in a warm-blooded animal in need thereof, which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as claimed in claim
 1. 35. A method for treating a disease or medical condition selected from cancer (solid tumours and leukaemias), fibroproliferative and differentiative disorders, psoriasis, rheumatoid arthritis, Kaposi's sarcoma, haemangioma, acute and chronic nephropathies, atheroma, atherosclerosis, arterial restenosis, autoimmune diseases, acute and chronic inflammation, bone diseases and ocular diseases with retinal vessel proliferation, in a warm-blooded animal in need thereof, which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as claimed in claim
 1. 36. A method of treating cancer in a warm-blooded animal in need thereof, which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as claimed in claim
 1. 37. The method of claim 36 wherein said cancer is selected from leukaemia, breast cancer, lung cancer, colorectal cancer, stomach cancer, prostate cancer, bladder cancer, pancreatic cancer, ovarian cancer, liver cancer, kidney cancer, skin cancer and cancer of the vulva.
 38. A method for preventing hair loss arising from the treatment of malignant conditions with pharmaceutical agents in a warm-blooded animal in need thereof, which comprises administering to said animal an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt or in vivo hydrolysable ester thereof as claimed in claim
 1. 